【单选题】

When the bell rang announcing the end of class, students came out ______
A．by twos and threes

B．by two and three
C．by two or three
D．by twos or threes

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参考答案：

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根据网考网移动考试中心的统计，该试题：

53%的考友选择了A选项

39%的考友选择了B选项

3%的考友选择了C选项

5%的考友选择了D选项

When the bell rang announcing the end of class, students came out ______A．by twos and threes