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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

试题分析:句意为:她看上去很高兴,一定是通过了考试。因为前面她很开心了,所以推断她肯定是通过了考试了,因为这个推断的可能性比较大,所以用must have done“过去一定做了”,could have done本可以做却没有做,might have done过去可能做了…,所以选C。
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