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【题目】The machines are made ________ at full speed.

A.workB.workingC.to workD.to be worked

【答案】C

【解析】

考查动词不定式。句意:这些机器是全速运转的。make作为使让动词后面接省略to的不定式结构,make sb. /sth. do…,变为被动语态结构,需要加tosb./sth. be made to do,本句为被动语态结构,故选C项。

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