More and more people have come to realize that if we had taken effective measures much earlier, the air quality ______ so seriously now.
A．is not pollutedB．would not be polluted
C．had not been pollutedD．would not have been polluted
B

試題分析：句意， 越來越多的人意識到如果我們早點采取有效地措施，現(xiàn)在空氣污染就不會這么嚴重了。If條件從句是對過去的虛擬，故用過去完成時，而主句是對現(xiàn)在的虛擬，故用would do形式。
點評：所謂錯綜時間條件句即條件從句與主句所指時間不一致，如從句指過去，而主句即指的是現(xiàn)在或將來，此時應根據(jù)具體的語境情況，主、從句動詞的形式應根據(jù)各自所表示的時間進行調整。
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