By working hard he acquired an extraordinary______ of the English language.

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问题 By working hard he acquired an extraordinary______ of the English language.

选项 A、proficiency
B、efficiency
C、effectiveness
D、command

答案D

解析 command n.掌握，运用能力；命令，指挥(如：He has[a]good command of spoken French．Who issued the command to fire?take／assume／be in command of；He has a hundred men under his command．在他的指挥下。I’m at your command．听候你的差遣。It was done by the Queen’s command．根据女王的命令。)proficiency n．熟练程度，掌握程度，精通。efficiency n．效率；功效。effectiveness n.效力，有效。

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By working hard he acquired an extraordinary______ of the English language.

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SofarasIknow,MissHannahArendtwasthefirstpersontodefinetheessentialdifferencebetweenworkandlabor.Tobehappy,

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Thestudentsexpectedthere_____morereviewingclassesbeforethefinalexams.

Interracialmarriagesandrelationshipshavebecomeincreasinglyacceptedandencouragedbysociety.Sincethe1967legalization

Theattemptandoffertocarryoutcloningexperimentonhumanbeingisblameworthyandcanhardlyfindany____amongthepublic

SallyKemmererhas,sofar,escapedNorthernCalifornia’srollingblackouts.ButupontheroofforherOaklandhome,workersa

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