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【题目】The mobile phone________in 1973.

A. invents B. is invented

C. invented D. was invented

【答案】D

【解析】句意:移动电话在1973年发明的考查被动语态。根据主语和语境及句意可知用被动语态,被动语态的构成:主语(动作的承受着)+be 动词的过去分词+sth.+by+动作的执行者;根据时间(1973年)可知用过去式,故be动词用was;所以选D。

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