The students are cleaning the classroom.They are busy.(合并成一句）
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Thestudentsarecleaningtheclassroom.Theyarebusy.(合并成一句）Thestudentsarecleaningtheclassroom.Theyarebusy
The students are cleaning the classroom.They are busy.(合并成一句）
The students are cleaning the classroom.They are busy.(合并成一句）
The students are cleaning the classroom.They are busy.(合并成一句）
The student are very busy because they are cleanig the classroom请采纳