we"ve studied at this school for two years同义句 It'S_ _ _ _we came to study at this school————是4个空的意思

It's been_ two years since_ _ _we came to study at this school

two years ago when
It's two years ago when we came to sudy at this school.
由现在完成时的叙述变为一般过去时的叙述

同义句是：
It's been two years since we came to study at this school。
意思就是我们两年前加入到学校的，所以是原句的同义句。

It's two years ago that we came to study at this school.
原句是一个现在完成时态，强调的是对现在的影响。
改为有It is。。。that。。。引导的强调句型。

been two years since

It's been two years since we came to study at this school
自从我们来这个学校已经两年了
O(∩_∩)O！