----Did you look up the time of the high-speed trains to Shanghai?
----Yes, the early train is to leave at 5:30 a.m.
A. likely
B. possible
C. due
D. about
网友回答
A. likely
B. possible
(答案→)C. due
D. about
解析：考查形容词：A. likely可能B. possible可能C. due应该，到期，预期，D. about用于be about to do即将做，句意：-你查看去上海的高铁的时间表吗？--是，早班火车预计早上5：30离开。选C。