The train was to arrive at 11:30 but was an hour late.A. aboutB. likelyC. certainD. suppos

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。