问题
选择题
He became a famous writer when he was ______. [ ]
A. in his fifty
B. in his fifties
C. in fifty years old
D. in fifties
答案
答案：B
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He became a famous writer when he was ______. [ ]
A. in his fifty
B. in his fifties
C. in fifty years old
D. in fifties
答案：B