2. 外语
  3. There is ample evidence, derived from the lore of traditional folk medicine, that naturally occurring antibiotics are usually ab

There is ample evidence, derived from the lore of traditional folk medicine, that naturally occurring antibiotics are usually ab

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问题 There is ample evidence, derived from the lore of traditional folk medicine, that naturally occurring antibiotics are usually able to be modified to make them a more effective drug.
选项 A、are usually able to be modified to make them a more effective drug
B、are usually able to be modified to make them more effective drugs
C、are usually able to modified,which makes them more effective drugs
D、can usually be modified to make them a more effective drug
E、can usually be modified to make them more eifective drugs
答案E
解析 A、D中末尾的a与前面的复数形式them不对应。C中which的先行词找不到，若修饰antibiotics，又改变了句意。B、E从意思上都对。但在公理中已提到，can优先于be able to，选E。
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