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用How many Why What Where How How much When Who 来填空
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How many,how ofen,how much,how long的区别
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How;How many; How much; How long; How often;How big; How hea
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用who,what,when,where,how old,how many,how often分别造反问句
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how often,how many,how much,how long,how soon的区别