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答案：
E
考点：句法
结构 逻辑语义
polio是主语，although引导的从句中主语和主句相同，且从句中谓语动词是be动词，则从句中的主谓可省；
A 主语是polio，it continues中it重复；错误
B 同A
C 原句中句子的重心在polio continues ... C中句子的重心发生改变
D having been eradicated表达wordy； is capable of being表达wordy
E 正确 
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