2. 外语
  3. (Pollute) ______ was a problem in the past as well as in the present.

(Pollute) ______ was a problem in the past as well as in the present.

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问题 (Pollute) ______ was a problem in the past as well as in the present.
选项
答案Pollution
解析 本题测试的是词性转换。全句的意思是：“过去以及现在都存在污染问题。”括号中给出的是动词pollute，显然这需要一个名词短语作主语，因此这里应该将动词pollute转换成名词pollution。
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