Question

He was told that it would be at least there more months ( ) he could recoveer and return to work.

A.when B.before 为什么选B而不选A? 再问下，这个”when“和”before“填的时候怎么区分?

Answer 1

很简单，因为前面的three
months是“3个月”。when是短暂性的”时间点“，很明显这里不是短时间。
而before可以接长的“时间"。
比较下面两句话。你就知道when和before的区别了:
It
was
10
o'clock
when
the
teacher
came
in
the
classroom.老师进教室的时候是10点钟。(时间点)
It
was
more
than
10
hours
before
the
teacher
came
in
the
classroom.老师进教室之前已经过了10个小时了。(时间段)