—Did Mary come to the party?

—I don’t know.She______while I was out.

A.may have come                       B.must have come

C.might come                            D.could come

---- Did Mary come to the party?

   ---- I don’t know. She _____ while I was out.

   A. might have come    B. might come   C. should have come    D. must have come

-----Did Mary come to the party?
---I don’t know．She _____while I was out．

-----Did Mary come to the party?

---I don’t know．She _____while I was out．

A．may have come B．must have come

C．might come D．could come

---Did Mary come to the party?

---I don’t know．She ______while I was out．

1. A.
   may have come
2. B.
   must have come
3. C.
   might come
4. D.
   could come