题目内容：

Lily has some idea - she's giong to be when she goes up
A what B that C as D which 为什么不选 B 呢

优质解答

What 和that的区别
what不仅引导,还充当句子的成分.that不充当成分.
请看：
What he said is wrong.
The words that he said is wrong.
What =n.+that