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【题目】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: 第一部手机是在20世纪70年代的美国发明的。

in the+ 世纪百位进数+十位年代数+s,固定搭配,在......世纪......年代,故答案选C

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