连词成句 the,students,singing,song,the,teacher,entered,the,classroom,a,were,when

连词成句 the,students,singing,song,the,teacher,entered,the,classroom,a,were,when

题目

连词成句 the,students,singing,song,the,teacher,entered,the,classroom,a,were,when

答案

The students were sining a song when the teacher entered the classroom

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