_____ ,my grandfather worked as a teacher.A.On the 1950sB.In the 1950sC.At the 1950sD.In 1950s

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_____ ,my grandfather worked as a teacher.A.On the 1950sB.In the 1950sC.At the 1950sD.In 1950s
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_____ ,my grandfather worked as a teacher.A.On the 1950sB.In the 1950sC.At the 1950sD.In 1950s
_____ ,my grandfather worked as a teacher.
A.On the 1950s
B.In the 1950s
C.At the 1950s
D.In 1950s

_____ ,my grandfather worked as a teacher.A.On the 1950sB.In the 1950sC.At the 1950sD.In 1950s
B.In the 1950s 在20世纪50年代

比较: in 1950 在1950年
逢十的复数数词前面加the, 表示某个世纪的几十年代

再由于是个时间段, 前面用in


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In 1950s,my grandfather worked as a teacher.
年份是没有加the,而且一定用in

B. 一定要加the

D.In 1950s
在20世纪,50年代,我祖父是一名教师