Question

_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

Answer 1

C

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。