Question

 5. — She looks very happy. She __________ have passed the exam.

— I guess so. It’s not difficult after all.

A. should       B. could

C. must   D. might

Answer 1

C。

解析:

“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。