问题
选择题
— 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
答案
C。
“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。