题目内容
-----_____ do you exercise?
-----Once a week.
| A.How long | B.How often |
| C.How far | D.How soon |
B
解析试题分析:How long多长时间;How soon多久以后;How often多久一次;How far多远。根据下文,Once a week.,一周一次,可知前文问的是,多久一次,故选B。
考点:考查特殊疑问词词组。
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