23、 He must have had an accident,or he___ here then.

问题描述:

23、 He must have had an accident,or he___ here then.
A、would have been
B、should be
C、had to be
D、would be

A
虚拟语气.前半句用了现在完成时,所以后半句也应该用现在完成时.