--( ) did you start to play tennis?

问题描述:

--( ) did you start to play tennis?
--I started to play tennis when I was seven.
A.When B.How long C.What time D.How far
选择,说明,

选A 回答how long是用具体多长时间,比如 7years 回答 What time 是具体时间 几点钟 比如2001年 How far 是问多远的意思..