It was ____ I met Mr.Green in Shanghai.A.many years that B.many years beforeC.many years ago that D.many years when为什么选c不能选b啊?

It was ____ I met Mr.Green in Shanghai.A.many years that B.many years beforeC.many years ago that D.many years when为什么选c不能选b啊?
It was ____ I met Mr.Green in Shanghai.
A.many years that
B.many years before
C.many years ago that
D.many years when
为什么选c不能选b啊?

It was ____ I met Mr.Green in Shanghai.A.many years that B.many years beforeC.many years ago that D.many years when为什么选c不能选b啊?
如果选b的话
得改为 it has been many years before.
因为后面是met 过去式 所以 前面得用过去分词

It is that 强调句
我在上海见到格林先生是很多年前的事了

I met Mr Green in Shanghai many years ago>>>It was many years ago that I met Mr Green in Shanghai.
做强调句时，要正过来，能联的通就对了
只有many years ago,没有many years before.
before后面要加时间的，而且要改成现在完成时

强调句呀