He's so lazy.That's ___ make him so poor.

问题描述:

He's so lazy.That's ___ make him so poor.
A   whenB   whereC   whatD   why    ,为什么?

你可能觉得应该选C吧,其实不对,如果用That's why he is poor.就对了
选what,我帮你改写一下句子,你就明白了:What makes him so poor is that he is so lazy.