一道英语语法选择题.Mary,turn off the water__you are brushing your teeth.
问题描述：
一道英语语法选择题.Mary,turn off the water__you are brushing your teeth.
---Mary,turn off the water__you are brushing your teeth.
---Sorry.I will do it at once.
A、until B、while C、during D、whether
我知道B有道理.为什么不能选C啊~
C是during.
答
during接一个时间段,比如three month
而while接一个时间点,比如刷牙时,while you are brushing your teeth