Personal computers _____ in 1976. It has changed the whole world. [ ]A. have been invented B. are invented C. were invented D. invented-初中英语-n多题

◎ 题干

Personal computers _____ in 1976. It has changed the whole world.

[ ]

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

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◎ 解析

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◎ 知识点

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