高考英语大宪章之必修一第一课时间状语从句

before引导时间状语从句，意为“过……之后才……”

课本原句

She and her family hid away for nearly twenty－five months before they were discovered.

她与家人躲藏了将近25个月之后才被发现

直击考点

A man escaped from the prison last pight. It was a long time before the guards discovered what had happened.

一名男子昨天晚上从监狱逃走。过了很长时间看守们才发现所发

生的情况。四级

Scientists say it may be five or ten years before it is possible to test this medicine on human beings.科学家们说，也许要5年或10年才有可能在人的身上试验这种药。六级

.(2017·全国卷Ⅲ)如果你错过这次机会，也许要过很久你才能得到另一次机会。

If you miss this chance, it may be long before you get another one.