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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

 

答案：A
提示：

題目考察動(dòng)詞過(guò)去分詞的被動(dòng)意義

 


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