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—When ________ personal computers ______...

—When ________ personal computers ________?

— In 1971.

A. was; discovered    B. were; invented

C. were; discovered    D. was; invented

 

B 【解析】句意:---- 个人电脑是什么时候被发明的?--- 在1971年。根据句意,结合答语中的时间,可知问句中的谓语动词需要使用一般过去时态,而个人电脑和谓语动词存在被动关系,结合一般过去时态中的被动语态构成:was/were done。故答案为:B。  
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