You must have waited here for a long time ,___________you?
#65489
A
mustn't
B
didn't
C
haven't
D
hadn't
推荐题目
---          a month do you do voluntary work ? ---Twice a month. 
#59864
A
How long
B
How many times
C
How much
D
How often
-----Have you got any carrots?   ----No, I _______.
#60151
A
have
B
haven’t
C
don’t
D
am not
Your sister must be helping the little girl with her homework, _______ ?
#64576
A
needn’t she
B
mustn’t she
C
isn’t she
D
must she
—_____will your sister be back ?—In about two hours.
#59910
A
How
B
How often
C
How long
D
How soon