【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(dòng)電話在1973年發(fā)明的。考查被動(dòng)語(yǔ)態(tài)。根據(jù)主語(yǔ)和語(yǔ)境及句意可知用被動(dòng)語(yǔ)態(tài)，被動(dòng)語(yǔ)態(tài)的構(gòu)成：主語(yǔ)（動(dòng)作的承受著）+be 動(dòng)詞的過(guò)去分詞+sth.+by+動(dòng)作的執(zhí)行者；根據(jù)時(shí)間（1973年）可知用過(guò)去式，故be動(dòng)詞用was；所以選D。

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