--do you go to the dentist?Let me see twice a year maybe.A. How manyB. How muchC. How

问题补充：

--do you go to the dentist?

--Let me see, twice a year, maybe.

A. How many

B. How much

C. How often

D. How soon

答案：

A. How many

B. How much

(答案→)C. How often

D. How soon

解析：句意：你多长时间去看一次牙医？让我想想看，也许一年两次吧。twice a year一年两次，表示频率，要用how often来提问，故选C。