问题补充：
The train was to arrive at 11:30,but was an hour late.
A. about
B. likely
C. certain
D. supposed
答案：
A. about
B. likely
C. certain
(答案→)D. supposed
解析：本题关键是抓住“but was now later’，说明火车应该在11：30到，但事实上没有，句中be supposed to相当于should。
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