---are you allowed to play on the computer in a week? A How

___are you allowed to play on the computer in a week? A How long B How soon C How far D How often
答案选D,为什么A不能选?
用How often提问不是就不用in a week了吗?
一周几次不是用How many times提问吗？
一周内玩多长时间 How long意思也对啊。