Unless to speak you should remain silent at the meeting. A. invitedB. inviting C. being i

问题补充：

Unless to speak, you should remain silent at the meeting.

A. invited

B. inviting

C. being invited

D. having invited

答案：

(答案→)A. invited

B. inviting

C. being invited

D. having invited

解析：考查省略。当状语从句的主语与主句主语一致的时候，可以把状语从句的主语和be动词一起省略。本题在unless与invited之间省略了you are.句意：除非别人和你说话，你在会议上一致要保持沉默。