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    【题目】Peter, as well as his assistant,_________a chemical experiment yesterday, but I wonder whether he has finished it.

    A.performedB.was performingC.had performedD.were performing

    【答案】A

    【解析】

    考查主谓一致和时态。句意：彼得和他的助手昨天做了一个化学实验，但我不知道他是否完成了。在A as well as B结构中，主语为A，因此谓语动词由A决定，由yesterday可知，时态为一般过去时。故选A项。

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