Computers first came into use ________.
A. in 1950s                B. on the 1950s            C. in the 1950s
C

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