---Could I go boating this weekend, Dad?---Yes, you ________. But you ________ come back before lunch.
#74541
A
could; must
B
can; must
C
could; should
D
must; should
推荐题目
—Could I please use your computer?—             .
#63566
A
Yes, I can.
B
Yes, you can’t
C
Sorry, you can’t
D
No, I can’t.
You ________ come tomorrow. I can do it myself.
#76439
A
needn’t
B
mustn’t
C
can’t
D
shouldn’t
We         arrive at six. But I’m sorry we are late. 
#63290
A
should
B
were supposed to
C
must
D
ought to