—John, ______ do you visit your grandparents?
—Once a week.
A. how long B. how soon
C. how often D. how much
—John, ______ do you visit your grandparents?
—Once a week.
A. how long B. how soon
C. how often D. how much
C。对副词的考查。how long和 how soon问的是多久，how much问的是多少钱，how often问的是频率。由答句可知问的是频率，所以选C。