题目内容

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

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

【答案】B

【解析】考查时态。句意:你为什么在这里?你应该正在实验室里做实验。表示正在做某事用进行时态,故选B项。

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