Do you know the reason he was late?A. of whichB. for thatC. for whichD. of that

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A. of which
B. for that
(答案→)C. for which
D. of that
解析：考查定语从句中的介词来源。本题的for是定语从句中的be late for…结构中的介词提前的用法。句意：你知道他迟到的原因吗？AD项的介词错误，B项中that不能放在介词的后面。