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    【题目】—She looks very happy. She ______ have passe d the exam —I guess so. It’s not difficult after all.
    A.should
    B.could
    C.must
    D.Might

    【答案】C
    【解析】“must have＋动词的过去分词形式”表示“过去一定做了某事”。根据“She looks very happy.”可以看出她一定是通过了考试。“should have＋动词的过去分词形式”表示“本来应该做某事但却没做”，常表责备语气；“could have＋动词的过去分词形式”表示“本来能够做某事但却没做”；“might have＋动词的过去分词形式”表示推测过 去“可能发生了某事”；句意：—她看起来非常高兴。她一定通过了考试。—我想是的。考试根本就不难。根据句意，故选C。

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