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【单选题】

Good pencil erasers are soft enough not ________paper but hard enough so that they crumble gradually when used.
A．by damaging

B．so that they damage
C．to damage
D．damaging
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根据网考网移动考试中心的统计，该试题：

2%的考友选择了A选项

25%的考友选择了B选项

72%的考友选择了C选项

1%的考友选择了D选项

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