—do you go to see your uncle?—Three times a month. A. How longB. How manyC. How oftenD. Ho

问题补充：

—do you go to see your uncle?

—Three times a month.

A. How long

B. How many

C. How often

D. How old

答案：

A. How long

B. How many

(答案→)C. How often

D. How old

解析：句意：你多久看望你叔叔一次？。How long多长；How soon多久；How often多久一次；How much多少钱。根据下文，Three times a month，一月三次，可知前文问的是，多久一次，故选。