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They were angry because you __________ your promise.
A、didn't keep
B、have not kept
C、don't keep
D、had not kept
【正确答案】：D
【题目解析】：【答案精解】D。句意：由于你没有遵守诺言，他们很生气。本题考查的是动词时态。主句用过去时，原因状语从句的动作发生在“生气”这件事前，所以时态需要用过去完成时。故选D。