Butforhermother'ssuddenillness,shewouldneverthinkingofb...

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But for her mother's sudden illness, she would never thinking of breaking this ________ with you.

A. arrangement B. schedule

C. appointment D. interview

C　句意：要不是她妈妈突然得病，她从没想过这次会对你失约。arrangement“安排”； schedule“时间表”； appointment“约会；约定”； interview“采访”，故选C项。