I don't know when I can climb the Great Wall(改为简单句）I don't know--_英语解答

I don't know when I can climb the Great Wall(改为简单句）
I don't know----- ------- -------the Great Wall

人气：452 ℃　时间：2020-01-29 20:56:17

解答

I don't know when to climb the Great Wall.