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Themobilephone    in1973. A.invents B.isinvented C.inve...

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Themobilephone    in1973. A.invents B.isinvented C.inve...

The mobile phone     in 1973.

A. invents  B. is invented  C. invented  D. was invented

【回答】

D

知识点:动词语态

题型:选择题