问题
选择题
—_____ do you visit your grandfather? 
—Once every two weeks.[ ]
A. how long
B. How soon
C. How much
D. How often
答案
答案：D
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—_____ do you visit your grandfather?
—Once every two weeks.[ ]
A. how long
B. How soon
C. How much
D. How often
答案：D