Question

Mary is so wet. She _______ in the rain.

1. A.
   must be caught
2. B.
   must have been caught
3. C.
   should have been caught
4. D.
   can have been caught

Answer 1

B

这题考查情态动词表示对过去情况的推测的用法，根据Mary is so wet.玛丽淋湿了，推测一定是过去遭雨了，must have done 就是对过去的肯定推测。所以选B。