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：考察连词。However然而，therefore因此 nevertheless 然而 otherwise 否则
句意为，你最好提前订票，负责我们可能会错过音乐会。