题干
—She looks very happy. She ____have passed the exam.
—I guess so. It's not difficult after all.
A：should
B：could
C：might
D：must
答案(点此获取答案解析）
D
—She looks very happy. She ____have passed the exam.
—I guess so. It's not difficult after all.
A：should
B：could
C：might
D：must
