—I regret _____ you that Mary was badly injured in the accident. —I can hardly believe my eyes. She is always so careful.A.informingB.having informedC.to informD.to have informed
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C解析试题分析：考查regret用法。动词regret有两个短语：regret to do sth遗憾要做某事；regret doing/having done sth遗憾做了某事；句意：我很遗憾地告诉你Mary在事故中受了重伤。故C心中却。考点：考查regret用法
点评：要注意该词连接不定式和动名词所表示的不同的意义，要区别事情未做还是已经完成。这样的用法在日常学习中要注意积累的归类。