问题补充:
_Could I go to the movie this Sunday, Dad?
_ Yes, you. But you come back before nine.
A. should, can
B. must ,have to
C. can , have to
D. need, must
答案:
A. should, can
B. must ,have to
(答案→)C. can , have to
D. need, must
解析:此题重点考查情态动词的基本用法。Could表示委婉语气而不是时态。Must表示命令意思是必须,表示主动,have to表示被动。