Unless ____to speak ,you should remain silent at the confere

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.

peter_dmh 1年前已收到2个回答举报

芦花白幼苗

共回答了14个问题采纳率：100% 举报

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!

1年前

夏天的雪花493 幼苗

共回答了77个问题举报

c当然不可以了，至少也要having been invited，这个答案本身就不完整

1年前

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