问题补充:
— Dad, must we wait until the light becomes green?
— Yes, I’m afraid we . That’s the traffic rule.
A. can
B. may
C. have to
D. need
答案:
A. can
B. may
(答案→)C. have to
D. need
解析:句意:-爸爸,我们必须等到交通灯变绿吗?-是的,恐怕我们必须得这样,这是交通规则。can 能,会;may 可以;have to 必须,不得不;need 需要。本题考查的是情态动词,根据句意这里我们必须要遵守交通规则,故选C。