.—______ a year does your school have sports meeting? —Twice a year

题目

.—______ a year does your school have sports meeting? —Twice a year
A. How often B. How soon C. How long D. How many times
答案是D,请帮我分析一下,谢谢!

答案

若前面没有a year 则选How often,How often在此就是How many times a year 的含义.