All possible means ___ been tried to stop the air______.
A．has, pollutedB．have, polluting
C．have, being pollutedD．has, being polluted
C
第一空考查主謂一致means是單復(fù)同形的名詞本句中有all視為復(fù)數(shù)；第二空考查短語stop …(from)…“阻止做某事”空氣應(yīng)是被污染要用動(dòng)名詞的被動(dòng)式。句意為：已經(jīng)嘗試了所有的方法來阻止空氣被污染。選C
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