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【单选题】

Observations were made ______ the children at the beginning and at the end of preschool and first grade.

A、 towards
B、of
C、 on
D、at

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根据网考网移动考试中心的统计，该试题：

20%的考友选择了A选项

53%的考友选择了B选项

24%的考友选择了C选项

3%的考友选择了D选项

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