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

分析 我們應(yīng)該盡力防止水污染,因?yàn)槿穗x不開(kāi)水.

解答 答案:polluting.結(jié)合前后文是說(shuō)人離不開(kāi)水,所以要阻止水污染,the state of being dirty表示變臟的狀態(tài),也就是污染pollute,結(jié)合prevent阻止,用prevent sb/sth (from)doing,pollute的動(dòng)名詞 polluting,故答案是polluting.

點(diǎn)評(píng) prevent…from短語(yǔ)的意思是"阻止…的發(fā)生".類(lèi)似的短語(yǔ)還有stop…from,keep…from.當(dāng)prevent/stop…from用于主動(dòng)語(yǔ)態(tài)時(shí),介詞from可以省略,但當(dāng)prevent/stop…from用于被動(dòng)語(yǔ)態(tài)時(shí),介詞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.大雪阻止了我們外出活動(dòng).

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