Computers first came into use ________.

A. in 1950s B. on the 1950s C. in the 1950s

 

C

【解析】

試題分析：句意:電腦首次被使用是在20世紀50年代。在某個世紀某個年代應該用介詞in，還應該在in后用定冠詞，在數(shù)字后加s,根據(jù)句意故選C。

考點：考查短語的用法。

 

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