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

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

【答案】C

【解析】

句意“个人电脑在1976年发明,它已经改变了整个世界”。根据in1976可知,用一般过去时,排除AD,且主语personal computersinvent之间为被动,故选C。

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