Some try out for the school teams,___ others join school sports leagues
问题描述：
Some try out for the school teams,___ others join school sports leagues
A while
B until
C when
说明理由
答
A,对称结构
while有At the same time that的意思,一般用于链接一个对称结构,如“某人在干什么,另一人在干什么.”有常用于比较不同类型人的同时发生的动作.用法和when有几分神似.但是.when常出现在下列句型中：She was listening to the music when her mother came in.