We arrive at six. But I’m sorry we are late. A. shouldB. were supposed toC. mustD. ought t

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A. should
(答案→)B. were supposed to
C. must
D. ought to
解析：考查情态动词：was/were supposed to do sth表示“本期望做某事”，但是实际并没有做到。should/ought to do sth都是“应该做某事”的意思must是“必须”的意思。根据后一句话得知“我们迟到了，没有按时到”，所以选择B，，也可以用should /ought to have done sth，用来表示“本应该做某事，但事实上没有做”。选B。