题目内容

12．We should try our best to prevent waterpolluting（the state of being dirty） because people can't live without water．

分析 我们应该尽力防止水污染，因为人离不开水．

解答 答案：polluting．结合前后文是说人离不开水，所以要阻止水污染，the state of being dirty表示变脏的状态，也就是污染pollute，结合prevent阻止，用prevent sb/sth （from）doing，pollute的动名词 polluting，故答案是polluting．

点评 prevent…from短语的意思是"阻止…的发生"．类似的短语还有stop…from，keep…from．当prevent/stop…from用于主动语态时，介词from可以省略，但当prevent/stop…from用于被动语态时，介词from不可以省略．如：The heavy snow prevented us from going out for sports．=The heavy snow prevented our going out for sports．大雪阻止了我们外出活动．

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