Question

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

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

Answer 1

【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to，sb./sth. be made to do，本句为被动语态结构，故选C项。