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------She looks very happy. She ______ have passed the exam.
------I guess so. It’s not difficult after all.
A.shouldB.couldC.mustD.might
C
考查情态动词用法。Should have done本应该做某事实际上却未做;could have done本可以做却未做;must have done一定做了某事;might have done也许做了某事。句意:—她看上去很开心,她肯定通过了考试。—我猜是这样。毕竟试卷不难。
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