we travelled by night as well as by day.为什么用by at为什么不行

分类: 作业答案 • 2022-01-09 18:01:57

问题描述：

答

by day和by night意思是,during the day ,during the night 就把它们当成固定搭配来记忆.
at night也是说得通的.但是at day说不通,通常说in the daytime,during the daytime,by dag等等