(2013·甘肃河西五市一模)Look! The ground is wet. It must have rained last night, ________?
#64489
A
hasn't it
B
hadn't it
C
mustn't it
D
didn't it
推荐题目
---Is this your basketball?---   ________.
#60150
A
Yes, it’s.
B
No, it’s not.
C
Yes, it is.
D
No, it is.
---______ do you exercise? ---Once a week.
#60191
A
How long
B
How often
C
How many
D
How old