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

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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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