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  ----         do the students exercise a week?    ---- Once or twice.
A. How long            B. How often            C. How many times
B

试题分析:句意:-这些学生一周锻炼几次?-一次或两次。how long 多长时间,对一段时间提问;how often 多久一次,提问频率;how many times 多少次,time 表示三次或以上。故选B。
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