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Whyareyouhere?Youaresupposedto

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問題詳情：

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

知識點：非謂語動詞

題型：選擇題

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