---I don’t know why he is late.
---Nor do I.He______an accident.

1. A.
   could have had
2. B.
   should have had
3. C.
   might have had
4. D.
   must have had

I don’t know why he is late.?

—Nor do I.He__________an accident.?

A.could have had                               B.should have had?

C.might have had                               D.must have had?