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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考博英语

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

考博英语

Hutuextremistsingovernmentorganizedthekillingandusedstateradiostationstourgeordinarypeopletocrushthecockroach

ThearomaofchocolateperfumestheairoftheRued’AssasinParis.EnteringChristianConstant’sstate-of-the-artboutique,yo

A、shallB、willC、wouldD、shouldD本题是对虚拟倒装条件句的考查，此时应省去连接词if，要将助动词should，had，were提前，表示一种设想。因此本题答案为D。

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PsychologistGeorgeSpilichandcolleaguesatWashingtonCollegeinChestertown,Maryland,decidedtofindoutwhether,asmany

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