英语改错learning Russian is very popular in1950s急

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英语改错learning Russian is very popular in1950s

Learning Russian was very popular in1950s.( is -> was)

过去式了,时间明显是过去的,is改成was

少了一个定冠词“the”还有“1950s”应该是“1950's”
Learning Russian is very popular in the 1950's

learning Russian was very popular in the 1950s
in the +整年+s表示 在哪个世纪什么年代