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题目内容
（延安大学 大学英语4）
He began to work there __________ .(本题2.0分)
A、 on his fifty
B、 at age of fifty
C、 when he fifty
D、 in his fifties
A、 on his fifty
B、 at age of fifty
C、 when he fifty
D、 in his fifties
参考答案
