【題目】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】

考查主謂一致和時態(tài)。句意：彼得和他的助手昨天做了一個化學實驗，但我不知道他是否完成了。在A as well as B結構中，主語為A，因此謂語動詞由A決定，由yesterday可知，時態(tài)為一般過去時。故選A項。

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