Unless to speak，you should remain silent at the conferenceA. invitedB. invitingC. being

发布时间：2020-08-16 22:58:55

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

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(答案→)A. invited
B. inviting
C. being invited
D. having invited
解析：本题考查过去分词在省略结构中的用法。Unless invited相当于 Unless you are invited。
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