2. 外语
  3. DDT, the most powerful pesticide the world A(has ever known), exposed nature’s vulnera-bility. Unlike most pesticides, B(whose e

DDT, the most powerful pesticide the world A(has ever known), exposed nature’s vulnera-bility. Unlike most pesticides, B(whose e

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问题 DDT, the most powerful pesticide the world A(has ever known), exposed nature’s vulnera-bility. Unlike most pesticides, B(whose effectiveness is) C(limited to destroy) one or two types of insects, DDT D(is capable of killing) hundreds of different kinds at once.
选项
答案C
解析 limited to destroy改为limited to destroying。limit to把……限制在，to是介词，后面接动词的现在分词形式。
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