He became a famous writer when he was ______ .A、in his fiftyB、in his fiftiesC、

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问题 He became a famous writer when he was ______ .

选项 A、in his fifty
B、in his fifties
C、in fifty years old

答案 B

解析 in one’s fifties表示“(某人)五十多岁时”:在表示“几十多岁时”,用逢十的基数词的复数形式。
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