问题补充：
— do you go to see your grandparents?
—Once a week.
A. How far
B. How long
C. How often
D. How soon
答案：
A. How far
B. How long
(答案→)C. How often
D. How soon
解析：How far多远；How long多长；How often多久一次；How soon多久。根据下文，每周一次。可知上文问的是，你多久去看你爷爷奶奶一次？故选C。
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