题目内容

“______ do you exercise?” Three times a week.”
A．How longB．How oftenC．How farD．How many
B 

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？
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