---- do the students exercise a week? ---- Once or twice.A. How lon
题型：不详难度：来源：
---- do the students exercise a week? ---- Once or twice.
A. How long B. How often C. How many times |
答案
| B |
解析
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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