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The train _____to arrive at 11:30, but it was an hour late.
A、was supposed
B、is supposed
C、supposes
D、supposed
【正确答案】：A
【题目解析】：考查固定短语。句意：那趟火车应该十一点半到，但是它晚了一个小时。be supposed to do sth.意为“应该做某事”，又因为本句时态为一般过去时，故选A。