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标题: 新东方语法教程，专题9，9题 [打印本页]

作者: everhappyin 时间: 2006-8-1 19:32
标题: 新东方语法教程，专题9，9题

There is an ample evidence, derived from the lore of traditional folk medecine, that naturally occuring antibiotics 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

(D) can usually be modified to make them a more effective drug

(E) can usually be modified to make them more effective drugs.

答案是E

请问be able to和can有什么区别？具体到这个句子中呢？

谢谢：）

作者: everhappyin 时间: 2006-8-2 10:10
顶一下，谢谢大家了：）

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