【題目】—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＋動詞的過去分詞形式”表示“過去一定做了某事”。根據(jù)“She looks very happy.”可以看出她一定是通過了考試�！皊hould have＋動詞的過去分詞形式”表示“本來應(yīng)該做某事但卻沒做”，常表責備語氣；“could have＋動詞的過去分詞形式”表示“本來能夠做某事但卻沒做”；“might have＋動詞的過去分詞形式”表示推測過 去“可能發(fā)生了某事”；句意：—她看起來非常高興。她一定通過了考試�！蚁胧堑摹？荚嚫揪筒浑y。根據(jù)句意，故選C。

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