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

Ainvited

Binviting

Cbeing invited

Dhaving invited

 

答案:A
提示:

除非被邀请,完整的句子是unless you are invited to speak, 因此句主语you和后面主句的主语一致,故可以省略,因为原句为被动态,所以应该用过去分词

 


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