题目内容


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