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He decided not to say anything at the meeting unless_________.

A.asking to B.to ask to C.asked to D.ask to

C

解析试题分析:考查非谓语动词和省略。He与ask之间是动宾关系,即“让他说”,应该用被动,排除A、B、D;句意:他决定在会议上保持沉默,除非被邀请才讲话。unless后省略了he was asked to say something。故选C。
考点:考查非谓语动词和省略

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