题目内容：

This school is quite different from_____ before A.what it was.B.that it was ...
This school is quite different from_____ before
A.what it was.B.that it was
为什么?讲的通俗点,为什么不选B?that不能指代school吗?

优质解答

这里what引导宾语从句,并且在从句中充当表语,而that引导宾语从句时,在从句中不充当成分,所以就是A了.