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o开头的大学英语四级单词大全

obey outward organize on on a diet on a scale object on account of on and on on behalf of on board on business on condition that on cue on demand on duty on earth on edge on end on file on fire on foot on line on loan on no account objective obligation oblige observation observe observer obstacle obtain obvious occasion occasional occupation occupy occur occurrence ocean o'clock off one's guard October odd odds and ends of of a kind of course of late of necessity of no account of note of one's own accord of sorts off off balance off duty off the air off the hook off the record offence offend offense offensive offer office officer official often oil okay old omit on the run on the shelf on the side on the spot on the spur of the moment on the strength of on the table on the trot on the whole on thin ice on time on top on top of once once and for all once in a while once more once upon a time on order on paper on purpose on record on sale one after another on occasion on one's conscience on one's guard on one's own on the quiet on schedule on that score on the air on the alert on the average on the button on the contrary on the go on the grounds of on the horizon on the hour on the house on the increase on the job on the move on the one hand on the other hand on the part of on the point of one by one one another one day one way or another oneself onion only on the road to orchestra order only too onto orderly ordinary open open up opening opera operate ore organisation organic organ organise organism organization origin original other other than otherwise ought to ounce our ours ourselves out out of out of action out of breath out of character out of control out of date out of doors out of hand out of joint out of line out of luck out of one's depth out of order out of place out of pocket out of practice out of print operation operational operator opinion opponent opportunity oppose opposite optimistic option optional or or else or so or something oral orange orbit out of work outcome outdoor outer outlet outline outlook output outset outside outstanding outward oval oven over over and above over and over again over the hill overall overcoat overcome overhead overlook overnight overseas overtake owe owing owing to own own up owner ox oxygen out of season out of sight out of sorts out of step out of stock out of the blue out of the ordinary out of the question out of the way out of touch with out of tune with out of use onward overhead overlook overhaul overhear overtake overthrow overtime overwhelm overwhelming overflow outfit orbit overview opportunity occasion occasional observation overpass observe ownership own owing oxygen obsolete overcome occur ornament ornate outside outer outermost outset offset orthodox opponent obedience obedient offer oppress optical offspring opt optional orient oriental orientation originate original origin oblige obligation orderly order operate operation outlook outskirts occupy occupation object objection objective obscure opaque oath obtain outstanding officiate officious odour organ office open organic official opening organism organize oratory orator oral overlap obstinate offensive offence obstacle offend odd odds oppose opposite outlet output optimistic optimize only omit omission out of luck orient oriental orientation origin original originate ornament orphan orthodox other otherwise ought ounce our ours ourselves out outbreak outcome outdoor outdoors outer outermost outfit outlet outline outlook output outset outside outskirts outstanding outward oven over overall overcoat overcome overestimate overflow overhaul overhead overhear overlap overlook overnight overpass oversea overtake overthrow overtime overview overwhelm overwhelming owe owing owl own owner ownership ox oxygen oak oar oath obedience obedient obey object objection objective obligation oblige obscure observation observe obsolete obstacle obstinate obstruction obtain obvious occasion occasional occupation occupy occur occurrence ocean Oceania o'clock October odd odds odor of off offend offense offensive offer office officer official offset offspring often oh oil OK old omit on once one oneself onion only onto onward opaque open opening opera operate operation operational operator opinion opponent opportunity oppose opposite oppress optical optimistic optimize option optional or oral orange orbit orchard orchestra order orderly ordinary ore organ organic organism organization

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