— 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
根據(jù)句意應(yīng)該是Lily過去肯定發(fā)生了一些事，should have happened過去本應(yīng)該做某事     could have happened過去可能做了某事，must have happened過去肯定做了某事，所以答案D。
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