I'm afraid he's more of a talker than a doer,which is _____ her never finis

问题描述:

I'm afraid he's more of a talker than a doer,which is _____ her never finis

I'm afraid he's more of a talker than a doer,which is _____ her never finishes anything.[     ]A.that
B.when
C.where
D.why

 
 
为什么不选A   what可以吗  而且如果为定语从句 不应该是the reason why

D
这是说明这种因果关系的,which is why .引出结果.
恐怕他只是一个说而不做的人,所以不会有所成的
请在客户端右上角评价点“满意”即可可以用what?绝对不可以, what 是代词,可从句不缺主语, 宾语, 缺的只是状语。从上下文的逻辑关系来看,这是因果关系所以选副词why