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---__________does your friend go fishing?
--About three times a month.
A.WhenB.How often
C.How longD.How much
答案:B
试题分析:句意:—你朋友多久钓一次鱼?—大约一月三次。A.When什么时候;B.How often 多久一次;       C.How long多长;D.How much多少,根据答语About three times a month.可知上文是问频率,所以要用how often提问,故选B。
考点:考查疑问词的用法