Question

Unless___________to speak, you should remain silent at the conference.

A.invited　　　　　　　 B.inviting

C.being invited　　 D.having invited

 

Answer 1

A

主句主语与invite具有被动关系，故此处应使用表被动关系的过去分词invited。unless invited to speak相当于unless you are invited to speak。故正确答案为：A。

句意：除非你被邀请讲话，否则在会议上你应该保持沉默。