All the students two groups by the teacher during the petition.
A. were divided into
B. were divided
C. divide into
D. divided into
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(答案→)A. were divided into
B. were divided
C. divide into
D. divided into
解析：divide分开；divide into分成。句意：在比赛期间，所有的学生被老师分成两组。结合语境可知本句描述的是过去发生的动作，句子主语是动作的对象，故用被动语态。