问题
选择题
—Did you look up the time of trains to Shanghai?
—Yes, the earliest train is _____ to leave at 5:30 am.
A．likely
B．about
C．possible
D．due
答案
答案：D
be due to do意为“应该…/预期的”；be about to do 不和时间状语连用；possible主语应为it；而likely与句意不合。