How long did he stay here?他在这儿呆了多久?
How long does it take to get to London from here?从这里到伦敦要多长时间?
How long is the river?这条河有多长?
How long did he stay here?他在这儿呆了多久?
How long does it take to get to London from here?从这里到伦敦要多长时间?
How long is the river?这条河有多长?