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【題目】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“個人電腦在1976年發(fā)明，它已經改變了整個世界”。根據in1976可知，用一般過去時，排除A和D，且主語personal computers與invent之間為被動，故選C。

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