It took us one week to finish the work.

问题描述:

It took us one week to finish the work.
我们花费了一周的时间完成了这项工作.
It是做什么的啊?
改成
we took one week to finish the work.
为什么不能we took one

it 在这里代替 to finish the work,因为主语是to finish the work太长,所以用代替.还有句子比如:我步行到那儿花费了多长时间,it took me a long time to walk there.句型就是:it take sb sometime to do sth...