— She looks very happy. She __________ have passed the exam.
— I guess so. It’s not difficult after all.
A．shouldB．could
C．mustD．might
C。
“must+have+過去分詞”表示對過去情況的肯定推測。由于“她看上去氣色不錯”，而且“考試也不難”，所以她一定是通過了考試。
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