【題目】—When ________ personal computers ________?

— In 1971.

A. was; discovered B. were; invented

C. were; discovered D. was; invented

【答案】B

【解析】句意:---- 個人電腦是什么時候被發(fā)明的?--- 1971年。根據(jù)句意,結(jié)合答語中的時間,可知問句中的謂語動詞需要使用一般過去時態(tài),而個人電腦和謂語動詞存在被動關(guān)系,結(jié)合一般過去時態(tài)中的被動語態(tài)構(gòu)成:was/were done。故答案為:B。

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