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