Question

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

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

Answer 1

【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A和D，且主语personal computers与invent之间为被动，故选C。