问题补充:
--- do you go to see your grandparents?
--- Once a week.
A. When
B. How much
C. How often
D. How long
答案:
A. When
B. How much
(答案→)C. How often
D. How long
解析:When什么时候;How much多少钱;How often多久一次;How long多长。根据答语,每周一次。可知上文对频度进行提问,选C。
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