--Kate, do you know ________ it is from here to the gym?--About twenty-minutes' walk.A.how longB.how farC.how soonD.how often
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B解析解析：考查特殊疑问词的用法。通过下文“About twenty-minutes' walk.”可以看出上文是对距离提问。用how far。而how long是对距离提问；how soon是对多久以后提问；how often是对频率提问。故选B。难度不大。