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问题: 个路英语高手,麻烦您了

To practise English conversation,the teacher had the students sit ____
A in two and three B in twos and threes C in two or three D in twos or threes

解答:

in twos and threes=in groups of two or three 三三两两
固定表达 没有道理可讲。
为了练习英语会话,老师让学生三三两两坐在一起。