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 Whyareyouhere?Youaresupposedto

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问题详情:

 Whyareyouhere?Youaresupposedto

 Why are you here? You are supposed to ______ the experiment in the lab.

   A. perform           B. be performing        C. have performed       D. be performed

【回答】

B

知识点:非谓语动词

题型:选择题

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