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 why he didn't come?
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 why he didn't come?