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

问题补充：

Do you know the reason he was late?

A. of which

B. for that

C. for which

D. of that

答案：

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。