He must have been ill,or he ______ to the party last night.

问题描述:

He must have been ill,or he ______ to the party last night.
Awould have been
B should be
C would be
D had to be

选A.表示过去的事情应该怎样
B:应该怎样,一般时态
C:将来时态
D.have to不得不怎样.总之不对啦