请定语从句do you know the reason for which he didn't come还原成简单句.
问题描述：
请定语从句do you know the reason for which he didn't come还原成简单句.
答
Do you know the reason？
He didn't come for the reason.
答
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答
Do you know the reason of his not coming?
注意：不能改成宾语从句。
答
do you know why he didn't come？
答
Do you know why he didn't come?
答
can you tell me why didn't he come.