travel 是延续动词,能和一段时间连用.
1 他已经在美国旅行了8天
He has been traveling in the United States eight days.
2 他在美国旅行多久?/ 多少天
How long /How many days does he travel in the US?
travel 是延续动词,能和一段时间连用.
1 他已经在美国旅行了8天
He has been traveling in the United States eight days.
2 他在美国旅行多久?/ 多少天
How long /How many days does he travel in the US?