I 单项选择：
1、— Have a nice weekend.
— _______ .
A. The same to you B. You do too C. The same as you D. You have it too
2、I _________ he will visit the United States with me.
A. am hoping B. hope C. have hoped D. hoped
3、—The woman biologist stayed in Africa stud ying wild animals for 13 years before she returned.
—Oh, dear! She ________ a lot of difficulties!
A. may undergo B. might undergo
C. ought to have undergone D. must have undergone
