Question

--________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

Answer 1

C

试题分析：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。