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Unless________ to speak, you should remain silent at the meeting.

A.invited

B.inviting

C.being invited

D.having invited

 

【答案】

A

【解析】考查省略。当状语从句的主语与主句主语一致的时候,可以把状语从句的主语和be动词一起省略。本题在unless与invited之间省略了you are.句意:除非别人和你说话,你在会议上一致要保持沉默。

 

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