Question

一道简单的英语题

__ sometimes keeps her awake all night __B___ Tom is getting more and more quiet at home.
A. That; which B. It; that C. Whether; what D. What; that
为什么不选D

Answer 1

如果选D
What sometimes keeps her awake all night that Tom is getting more and more quiet at home.
that前面缺少一个is
What sometimes keeps her awake all night （is） that Tom is getting more and more quiet at home.才是对的。

Answer 2

如果是D的话，前面What sometimes keeps her awake all night 为what引导的主语从句起主语作用，后面Tom is getting more and more quiet at home做的是宾语。这样按D选的话句子里就少了谓语动词，构不成一个完整的句子。

Answer 3

因为选d就是问句，而原题为句号。