(单选题)
Unless ______ to speak, you should remain silent at the conference.
A.invited
B.inviting
C.being invited
D.having invited
参考答案:A
参考解析:
考查省略句。句意:除非你被邀请发言,否则你应该在会议上保持安静。当状语从句的主语和主句的主语一致且从句谓语动词含有be动词时,可省略状语从句的主语和be动词。句子还原应为“Unless (you are) invited to speak”,表示“被邀请”。故选A。
知识点: