_Could I go to the movie this Sunday, Dad?
_ Yes, you . But you e back before nine.
A. should, can
B. must ,have to
C. can , have to
D. need, must
网友回答
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。