Unless to speak, you should remain silent at the conference. A. invited B. inviting C. being invited D. having invited 题目和参考答案——青夏教育精英家教网—

题目内容

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：

这句是省略句，全句为unless you are invited to speak，…

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