— do you have a sports meeting at your school?—Once a year. A. How soon B. How often C. Ho

问题补充：

— do you have a sports meeting at your school?

—Once a year.

A. How soon B. How often C. How long

答案：

解析：句意：---你们学校多入开一次运动会？---一年一次。how often 指每隔多久，主要用来对频度副词或状语(如：once a week, three times a month 等)提问。how soon 指再过多久，主要用来对表示将来的一段时间(如：in an hour, in two weeks 等)提问。how long表示多久。根据题意，故选B。