高二英语选择题一道Thereason()heexplainedisnottherealreason(）hedidn'tcome.A.why;whyB.that;thatC.why;thatD.that;why帮忙选择一下对的答案,其他答案为什么错误最好也说一下!

　　高二英语选择题一道

　　Thereason()heexplainedisnottherealreason(）hedidn'tcome.

　　A.why;whyB.that;thatC.why;thatD.that;why

　　帮忙选择一下对的答案,

　　其他答案为什么错误最好也说一下!