Unless to speak, you should remain silent at the conference. A. invited B. inviting C. being invited D. having invited 【查看更多】

 

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38.[2003春季上海] Unless ________ to speak, you should remain silent at the conference.

A. invited　　　　　　　　　　    B. inviting　　　　 

C. being invited　　　　　　　　　　    D. having invited

 

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38.[2003春季上海] Unless ________ to speak, you should remain silent at the conference.

A. invited　　　　　　　　　　    B. inviting　　　　 

C. being invited　　　　　　　　　　    D. having invited

 

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