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

试题分析:句意:电脑首次被使用是在20世纪50年代。在某个世纪某个年代应该用介词in,还应该在in后用定冠词,在数字后加s,根据句意故选C。
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