问题补充:
A: I go to the airport to see Uncle David off tomorrow morning, mum?
B: No, you needn’t. You may join us if you want to.
A. Must
B. Need
C. Should
D. May
答案:
(答案→)A. Must
B. Need
C. Should
D. May
解析:句意:——妈妈,我明天早上一定要去机场送戴维叔叔吗?——不,你不必。如果你想要去你可以加入我们。must回答的否定用needn ,意思为不必要的,故选择A。