Question

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````````

Answer 1

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 D选项是最佳答案

Answer 2

A、on his fifty 好像没有这个说法
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 病句 改为“when he was fifty”句义同B选项
D、in his fifties 译为“在他五十几岁的时候” 按整个句义来说，D选项是最佳答案

整句翻译为：他从五十几岁时开始 在那儿工作