高考英语语法

来源:百度知道 编辑:UC知道 时间:2024/05/21 08:20:06
请翻译
Finishing their shopping at the mall, a couple discovered that their new car had been stolen .They filed a report at the police station

请解释
He was a billionaire ___5___ the time he was 31.

答案是BY
为什么用BY呢??怎么翻译??

翻译:在商店购物完后,这对夫妇发现他们新买的车被偷了,他们向警局报案。

BY这个介词在这句话的意思是**之前,意思是在他31岁之前他已经是个百万富翁了