题目内容

Unless________ to speak, you should remain silent at the meeting.
A．invitedB．inviting
C．being invitedD．having invited
A
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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