-Did you look up the time of trains to Shanghai? -Yes, the earliest train is to

—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

试题答案

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。