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【题目】Personal computers ________ in 1976. It has changed the whole world.

A. have invented B. are invented C. were invented D. invented

【答案】C

【解析】

句意:个人电脑是1976发明的。它改变了整个世界。考查动词语态题。Personal computers是复数主语,它是动词invent的受动者,需用被动语态。in 1976是过去的时间,句子需用过去时,根据句意,可知选C。

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