The light bulb ______ by Edison in the middle of the 1780s.A．is inventedB．was inventedC．inventedD．invent-初中英语-n多题

◎ 题干

The light bulb ______ by Edison in the middle of the 1780s.

A．is invented

B．was invented

C．invented

D．invent

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◎ 解析

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◎ 知识点

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