定语从句do you know the reason why he didn't come?why为什么可以用For which代替用which的话后面一定

定语从句do you know the reason why he didn't come?why为什么可以用For which代替用which的话后面一定
要缺成分,而用why后面则不缺成分.两者不矛盾了吗?
英语人气:462 ℃时间:2019-09-19 07:53:37
优质解答
Do you know the reason why he didn't come?===Do you know the reason for which he didn't come?
语法:
the reason why==the reason for which
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