Mary is so wet. She in the rain.A. must be caughtB. must have been caughtC. should have

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A. must be caught
(答案→)B. must have been caught
C. should have been caught
D. can have been caught
解析：
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。