问题描述：
I had told him the reason,__I didn`t attend the class.A for which B at which C for whom D why
这道题的正确答案是出在for which 和 why里吗?这两个不是可以互换吗?
这道题的正确答案是出在for which 和 why里吗?这两个不是可以互换吗?
问题解答：
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