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.

分类: 作业答案 • 2022-05-16 20:50:53

问题描述：

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.

答

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

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...