Question

---Did Jim come?

---I don’t know. He _______ while I was out.

1. A.
   might have come
2. B.
   might come
3. C.
   mush have come
4. D.
   should have come

Answer 1

A
考查情态动词。根据句中有关时态可知“他来”发生在过去，故排除B；根据 I don’t
know 可知选项C语气太肯定，不合适；选项D的意思是“本来应该来”，与语境不合。