—Must I return the book tomorrow?—No, you ________.You can keep it for three days.
#63361
A
mustn't
B
needn't
C
can't
D
may not
推荐题目
I was really anxious about you. You _______ home without a word.
#63535
A
mustn’t leave
B
shouldn’t have left
C
couldn’t have left
D
needn’t leave
–Can you swim? --___________, but my brother Tom can. 
#74545
A
Yes, I can.
B
No, I can’t.
C
Yes, I do.
D
No, I don’t.