【題目】We must protect the ecosystem of the forest from________.

A.polluteB.pollutedC.being pollutedD.polluting

【答案】C

【解析】

句意：我們必須保護(hù)森林的生態(tài)系統(tǒng)不受污染。

考查非謂語(yǔ)動(dòng)詞。pollute污染，動(dòng)詞原形；polluted污染，動(dòng)詞過(guò)去式或者過(guò)去分詞；being polluted被污染，動(dòng)名詞被動(dòng)結(jié)構(gòu)；polluting污染，現(xiàn)在分詞或者動(dòng)名詞形式；根據(jù)句意理解可知，這里表達(dá)的是“保護(hù)……免遭……”，結(jié)構(gòu)是protect sb. from doing sth.，而這里the ecosystem of the forest與pollute之間是被動(dòng)關(guān)系，而from是介詞，所以這里應(yīng)該用動(dòng)名詞的被動(dòng)形式，形式是being polluted，故選C。

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