He apologised to me for his my letterA. delaying answeringB. delay to answerC. delaying

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A. delaying answering
B. delay to answer
(答案→)C. delaying to answering
D. delaying to answer
解析：介词后用动名词作宾语，“推迟做某事”delay to doing其中to为介词后接动名词。句意：他因为延迟给我们写信而道歉。