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Why are you here? You are supposed to __...

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

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

 

B 【解析】 试题分析: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。 考点:考查时态  
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