The reason for my refusal is ____ you're unreliable.

问题描述:

The reason for my refusal is ____ you're unreliable.
A.because B.that C.due to D.for
选哪一个,为什么?

选B
A和D都可以表示因为,这里已经有了reason,所以不需要因为了,常用的是the reason is that……
而Cdue to后边直接加名词就行了,不能跟一个从句.
有什么疑问还可以问我,