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用how old或how long填空:( ) did Tom learn ice skating?

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用how old或how long填空:( ) did Tom learn ice skating?
请告诉我为什么不是另一个?
不可以填how 意思是:汤姆多大开始学习滑冰的?
用how old或how long填空:( ) did Tom learn ice skating?
how old 用来提问年龄,后面接be 动词,如How old are you How old is Tom
how long 用来提问多久,表示一个延续性的动作持续了多长时间,如How long have you stayed here?你呆在这里多久了?