Unless ___ to speak, you should remain ...

Unless ___ to speak, you should remain silent at the conference.

A．invited

B．inviting

C．being invited

D．having invited

A 【解析】试题分析：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，由主动被动决定．由于＂你＂是被邀请的，所以应该用过去分词，故选A。考点：本题重点考查非谓语动词及省略用法。

考点分析：

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