问题:
- Excuse me, may I keep the book a little longer? - Sorry. You ________ return it today.
A.must
B.mustn"t
C.can
D.can"t
- Excuse me, may I keep the book a little longer? - Sorry. You ________ return it today.
A.must | B.mustn"t | C.can | D.can"t |
参考答案: