The train was to arrive at 11:30,but it was an hour late.
A. about
B. likely
C. certain
D. supposed
网友回答
A. about
B. likely
C. certain
(答案→)D. supposed
解析：考查固定词组。Be supposed to do sth应该做某事；be likely to do sth可能做某事；be about to do sth马上就要做某事；句意：火车本应该在11点30到达，但是晚到了一个小时。故D正确。