中文谷Hebegantoworkthere
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问题详情：
He began to work there____.
A. on his fifty B. at age of fifty C. when he fifty D. in his fifties
【回答】
C
知识点：数词
题型：选择题
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问题详情：
He began to work there____.
A. on his fifty B. at age of fifty C. when he fifty D. in his fifties
【回答】
C
知识点：数词
题型：选择题
