My uncle moved to London .A. in the fiftiesB. in the 1980s C. in his fiftyD. in 1990s

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A. in the fifties
(答案→)B. in the 1980s
C. in his fifty
D. in 1990s
解析：在二十世纪八十年代的表达法为in the 1980，在某人三十多岁时的表达法为 in one’s  thirties .故选B。