点拨: 多久一次,用来提问动作发生的频率。回答用:everyday, once a week, twice a month等词语。
多长,用来询问多长时间,也可询问某物有多长。
How long does it take to get to Shanghai from here? How long is the ruler?
多远, 用来询问距离,指路程的远近。
How far is it from here to the park? It's about 2 kilometers.
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