if you don't have enough time to walk dogs once a day,you ( ) get one

问题描述:

if you don't have enough time to walk dogs once a day,you ( ) get one
A must not B should C ought to D ought not to要注明原因

D
如果你一天之内连遛狗一次的时间都没有,那就不应该去领养一只狗.
D选项表示不应该,并没有强制之意;A选项表示不允许,态度强硬.