【題目】The mobile phone________in 1973.

A. invents B. is invented

C. invented D. was invented

【答案】D

【解析】句意:移動電話在1973年發(fā)明的。考查被動語態(tài)。根據(jù)主語和語境及句意可知用被動語態(tài),被動語態(tài)的構(gòu)成:主語(動作的承受著)+be 動詞的過去分詞+sth.+by+動作的執(zhí)行者;根據(jù)時間(1973年)可知用過去式,故be動詞用was;所以選D。

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