【題目】The first mobile phone was invented in the USA ________.

A. in 1970sB. in the 1970s'C. in the 1970s

【答案】C

【解析】

句意: 第一部手機是在20世紀70年代的美國發(fā)明的。

in the+ 世紀百位進數(shù)+十位年代數(shù)+s,固定搭配,在......世紀......年代,故答案選C。

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