问题
选择题
You’d better book the tickets as early as possible, ________ they will be sold out soon.
A．and
B．but
C．so
D．or
答案
答案：D
题目分析: 句意：你最好尽早订票，否则不义就卖光了。and并且，but但是，so所以， or否则。had better最好，后接动词原形；book预订；as early as尽早；sold out卖完；根据语境可知答案选D.