【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:
3%的考友选择了A选项
5%的考友选择了B选项
66%的考友选择了C选项
26%的考友选择了D选项