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

試題分析：How long“多長時間”， How far“多遠”，How many“多少”，How often詢問頻率，表示“多久一次”。 根據(jù)下文，一周三次。可知上文提問的是多久一次（頻率），故選B，你多久鍛煉一次？
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