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


  1. A.
    invited
  2. B.
    inviting
  3. C.
    being invited
  4. 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。
点评: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。
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