——She looks very happy. She       have passed the exam.    
——I guess so. It’s not difficult after all. 
A．shouldB．couldC．mustD．might
C

試題分析：句意為：她看上去很高興，一定是通過了考試。因為前面她很開心了，所以推斷她肯定是通過了考試了，因為這個推斷的可能性比較大，所以用must have done“過去一定做了”，could have done本可以做卻沒有做，might have done過去可能做了…，所以選C。
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