Какое из двух предложений правильное, А или Б? А. I don't know when he came. Б. I don't...

Question

Какое из двух предложений правильное, А или Б? А. I don't know when he came. Б. I don't know when did he come.

Answer 1

А́. I don't know when he came.

Answer 2

Ответ:

I don't know when he came.