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+过去分词”表示对过去情况的肯定推测。由于“她看上去气色不错”，而且“考试也不难”，所以她一定是通过了考试。