I don't know____he will be back.

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Idon''tknow____hewillbeback.Idon''tknow____hewillbeback.Idon''tknow____hewillbeback.when疑问代词什么时候回来HOWLO

I don't know____he will be back.
I don't know____he will be back.

I don't know____he will be back.
when疑问代词
什么时候回来

HOW LONG或者WHEN

when