题目内容：

"I want to beg a favour of you,sir .I want to sent a letter home.___what ____is ,"She said.
A it's;that B it's;it Cthat's;it D that's ;that
这个该选什么呢?
为什么这样选呢?
有什么语法知识吗?

优质解答

C
That 和 it 都指前面说的事情,that's what it is.可以按照固定搭配说法记：就是这么回事.