----I'd like to invite you to dinner at my flat before I move.----That ____ be nice.Let's fix date.

问题描述:

----I'd like to invite you to dinner at my flat before I move.----That ____ be nice.Let's fix date.
A.would
B.must
C.can
D.ought to

A.would
That would be nice= 那真太好了是固定搭配??如果不是请解释一下其他为什么不对,谢谢是习惯用法,也可以算是固定搭配,