Unless ____to speak ,you should remain silent at the confere

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Unless ____to speak ,you should remain silent at the conference.
A invited B inviting C been invited D having invited
为什么C不可以.

这是个Unless引导的条件状语从句的省略句,完整的句子应该是：
Unless you are invited to speak,you should remain silent at the conference.在条件状语从句中,主句用将来时,从句用一般现在时.这个句子中Unless引导的从句应该用一般现在时,被邀请则就是 invited!

Unless ____to speak ,you should remain silent at the confere Unless _____ to speak,you should remain silent at the confer 填空:Unless[ ](invite)to speak,you should remain silent at the Unless ___ to speak,you should remain silent at the conferen Unless__ to speak,you should remain silent at the conference 英语单句改错:unless invite to speak ,you should remain silent at t 高2英语过去分词1 Unless _____ to speak,you should remain silent at 高中语法－非谓语unless _____ to speak,you should remain silent at th 填空:Unless[ } (invite )to speak,you should remain silent at t Unless invited to speak,youshould remain silent at the confe Unless [ ] to speak ,she always remains silent at the confer 【高中英语,求分析】1.Unless______ to speak,you should remain silent a