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.

Do you know the reason?
He didn't come for the reason.

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Do you know the reason of his not coming?
注意:不能改成宾语从句。

do you know why he didn't come?

Do you know why he didn't come?

can you tell me why didn't he come.