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【題目】Why are you here? You are supposed to ________ the experiment in the lab.

A. performB. be performingC. have performedD. be performed

【答案】B

【解析】

試題分析：考查時態(tài)。句意：你為什么在這里？你應該正在實驗室里做實驗。表示“正在做某事”用進行時態(tài)，故選B項。

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