The light bulb by Edison in the middle of the 1780s.A. is inventedB. was inventedC. inven

发布时间：2020-08-23 08:28:00

The light bulb      by Edison in the middle of the 1780s.
A. is invented
B. was invented
C. invented
D. invent

网友回答

A. is invented
(答案→)B. was invented
C. invented
D. invent
解析：句意：电灯是爱迪生在18世纪80年代中期发明的。应用被动语态的过去时。句中有in the middle of the 1780s表示18世纪80年代中期，是一个过去时间，故用一般过去时的被动形式。
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