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.

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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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