more than an hour用什么提问?

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more than an hour用什么提问?
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more than an hour用什么提问?
more than an hour用什么提问?

more than an hour用什么提问?
how long
只要是对一段时间提问的,都用how long

how long ?

How soon

How long does your mother usually spend cleaning the house?
My mother usually spends more than half an hour cleaning the house.
http://zhidao.baidu.com/question/9014324.html?si=1

要用
how long

more than an hour 一个多小时,指一段时间,因此对此短语提问应用how long .

how long