请在此句中改错：Mother came back on December 21 when was my birthday .多谢了！

来源：百度知道 编辑：UC知道 时间：2024/06/28 09:39:58

把when改成which
从句修饰12月21日,强调是我的生日.

Mother came back on December 21 when it is my birthday

on Dec.21st , my birthday, mother came back.可以吗

在when后加it

应该把when改成which

was划去