——I just can't understand why Jack isn't here for my birththday party.

问题描述:

——I just can't understand why Jack isn't here for my birththday party.
——Oh,if it were not for the fact that he______il in bed for three day,he would.
A.therefore B.although C.since D.unless
为什么选A

选项是错的吧,肯定不是填连词之类的,应该是A had been B was 之类的选项吧,你再看看.