-- do you visit your grandparents Jane?-- Once a month.A. How soonB. How longC. How often

问题补充：

-- do you visit your grandparents, Jane?

-- Once a month.

A. How soon

B. How long

C. How often

D. How far

答案：

A. How soon

B. How long

(答案→)C. How often

D. How far

解析： A. How soon 多久，多快 B. How long 多长 回答长度C. How often多久一次 回答频率 D. How far 多远 回答距离 “你多久看一次奶奶”“一月一次”