one of our rules is that every student shall wearschool uniform w_英语解答

one of our rules is that every student shall wear
school uniform while at school 为什么用 while

人气：250 ℃　时间：2020-01-29 02:22:35

解答

while 指在.的时候那为什么不用whenat又是为什么when一般指时间点，而while一般指时间段，at school是指在学校期间，属于时间段，所以用while