问题
选择题
If you be in time for the early bus , be sure to get up before five o’clock in the morning.
A．are to
B．are about to
C．are going to
D．are due to
答案
A
题目分析：考查将来时的表达法。be to do sth表示将来时的时候，表示一种语气，非要做某事，相当于must，be sure to do sth；be about to do sth即将做某事，不与具体的将来时的时间状语连用；be going to do sth表示计划好要做某事，或者根据某种迹象要做某事；be due to do sth表示预定好了要做某事；句意：如果你一定要赶上早班公交车，务必要在5点之前就起床。故A正确。