Unless ____to speak ,you should remain silent at the conference.A_英语解答

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.

人气：196 ℃　时间：2020-06-15 11:41:35

解答

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...