You’d better book the tickets in advance; we may miss the concert.
A. however
B. therefore
C. nevertheless
D. otherwise
网友回答
A. however
B. therefore
C. nevertheless
(答案→)D. otherwise
解析：考查副词。However然而，therefore因此 nevertheless 然而 otherwise 否则，句意为，你最好提前订票，否则我们可能会错过音乐会。选D。