Unless to speak, you should remain silent at the conference. [ ] A．invitedB．invitingC．being invitedD．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：

unless (you are) invited to speak状语从句的省略形式.

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