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【单选题】

This problem requires ________ with great care.
A、study
B、to study
C、studying
D、being studied

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根据网考网移动考试中心的统计，该试题：

0%的考友选择了A选项

3%的考友选择了B选项

71%的考友选择了C选项

26%的考友选择了D选项

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