封国制是什么:初三选择题

来源:百度文库 编辑:高校问答 时间:2024/03/29 20:26:49
I’ve made it a rule ( )up late at night.
A.to stay
B.to staying
C.to be staying
D.for staying

这道题选a

这实际上是it作形式主语的用法。
it a rule ( )up late at night

可改写为 it is a rule to stay up late at night
或者to stay up late at night it is a rule
换成这样的方式来看,这个题目就很容易理解了。