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— Lily is a happy girl, but today she seems in a bad mood. —

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— Lily is a happy girl, but today she seems in a bad mood.
— Something ________ to her.
A.must happen B.should have happened
C.could have happened D.must have happened
D

根据句意应该是Lily过去肯定发生了一些事,should have happened过去本应该做某事     could have happened过去可能做了某事,must have happened过去肯定做了某事,所以答案D。