-–She looks very happy. She ________have passed the exam.  
--I guess so. It’s not difficult after all.
A．shouldB．mustC．couldD．might
B
她看起來很開心，所以她通過考試的可能性為最大，must表示一定的含義，可能性為最大，后半句的含義為他一定通過了考試，故本題選B。
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