Pleasant music is often played_________classes to make students refreshed and relaxed for a while.
问题描述：
Pleasant music is often played_________classes to make students refreshed and relaxed for a while.
A.between B.among C.over D.after
why?
答
因为后面说to make students refreshed and relaxe for a while.
即：使学生们恢复精力,放松一会儿!
refreshed and relaxed 是学生 课间 完成的~
课与课之间：between classes