题目内容
试着说出It的用法。
It's surprising that he should ask me such a difficult question.
It做________主语;指代________从句。
It's no use crying over spilt milk.It做________主语。
You may find it exciting working here.It做形式________;指代________短语。
We published it that we had won the football game.
It做形式________;指代________从句。