问题
选择题
—John, ______ do you visit your grandparents?
—Once a week.
A．how long
B．how soon
C．how often
D．how much
答案
答案：C
how long多长；how soon多久；how often多久一次；how much多少钱。根据下文，每周一次。可知上文提问频率，故选C。
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