Question

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 polluted	B．would not be polluted
C．had not been polluted	D．would not have been polluted

Answer 1

B

試題分析：句意， 越來(lái)越多的人意識(shí)到如果我們?cè)琰c(diǎn)采取有效地措施，現(xiàn)在空氣污染就不會(huì)這么嚴(yán)重了。If條件從句是對(duì)過(guò)去的虛擬，故用過(guò)去完成時(shí)，而主句是對(duì)現(xiàn)在的虛擬，故用would do形式。
點(diǎn)評(píng)：所謂錯(cuò)綜時(shí)間條件句即條件從句與主句所指時(shí)間不一致，如從句指過(guò)去，而主句即指的是現(xiàn)在或?qū)��?lái)，此時(shí)應(yīng)根據(jù)具體的語(yǔ)境情況，主、從句動(dòng)詞的形式應(yīng)根據(jù)各自所表示的時(shí)間進(jìn)行調(diào)整。