【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(xué)實(shí)驗,但我不知道他是否完成了。在A as well as B結(jié)構(gòu)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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