Unless to speak,you should remain silent at the conference.? A.invited B.inviting? C.being invited D.having invited? 题目和参考答案——青夏教育精英家教网—

题目内容

Unless ________ to speak,you should remain silent at the conference.?

A.invited　　　　　　　　　　　　　　　 B.inviting?

C.being invited　　　　　　　　　　　 D.having invited?

答案：A

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