【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(shí)態(tài)。句意：你為什么在這里？你應(yīng)該正在實(shí)驗(yàn)室里做實(shí)驗(yàn)。表示“正在做某事”用進(jìn)行時(shí)態(tài)，故選B項(xiàng)。

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