— does Jane exercise?—Four times a week.A. How soonB. What timeC. How longD. How often

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A. How soon
B. What time
C. How long
(答案→)D. How often
解析：How soon多久；What time几点，什么时间；How long多长；How often多久一次。根据下文，一周四次。可知上文问的是频度，故选D。