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【题目】Unless to speak, you should remain silent at the conference.
A.invited
B.inviting
C.being invited
D.having invited

【答案】A
【解析】考查非谓语动词。原句意思是,除非你被邀请发言,否则你应该在会议上保持安静。连词后可以直接加现在或过去分词,由主动或被动决定.由于"你"是被邀请的,所以应该用过去分词,所以答案是A。

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