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He began to work there ( ).A.on his fifty B.at the age of fi

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He began to work there ( ).A.on his fifty B.at the age of fifty C.when he fifty D.in his fifties
选D,but为什么?
每个选项的区别是什么?
PLEASE````````
He began to work there ( ).A.on his fifty B.at the age of fi
A、on his fifty 应该是in his fifties 介词复数错误,意思:在五十几岁的时候、
B、at the age of fifty 译为“在他五十岁时”,强调在他50岁那一年发生的事情
C、when he fifty 本打算用时间状语从句,但是语法错误,应改为“when he was fifty”
D、in his fifties 在他五十几岁的时候