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“______ do you exercise?” Three times a week.”

A.How long B.How often C.How far D.How many

解析试题分析:How long“多长时间”, How far“多远”,How many“多少”,How often询问频率,表示“多久一次”。 根据下文,一周三次。可知上文提问的是多久一次(频率),故选B,你多久锻炼一次?
考点:考查疑问词辨析。

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