You’d better book the tickets in advance; we may miss the concert.A. howeverB. thereforeC

问题补充：

You’d better book the tickets in advance; we may miss the concert.

A. however

B. therefore

C. nevertheless

D. otherwise\

答案：

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。