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---I heard your grandpa used to be a teacher.
--- Yes. He was a math teacher ________.
A.on the 1950sB.in the 1950sC.at the 1950’sD.in 1950’s
B
考察年代表达。年份后面加上s,表示某个年代,故选项CD年代表达错误。表示时间时,on表示在具体某一天,in表示在一个时间范围。年代属于一个时间范围,故用介词in,选B。
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