Our math teather is very patient and explains things to us___ ___ ___ ___(一次又一次).
问题描述：
Our math teather is very patient and explains things to us___ ___ ___ ___(一次又一次).
答
4个空？
3个空俺会，4个就不会了。。。
答
over and over again， 一次又一次。
三个空是again and again,
答
over and over again
答
once and again.
不知道为啥有四个空。
答
time and time again
相当于again and again
含义为“一次又一次地”