If we had taken such effective measures much earlier, the river ________ 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：本句從句與過去的事實相反，而主句與現(xiàn)在的事實相反，這里now是解題關鍵。句意：如果我們早些采取如此有效的措施，這條河現(xiàn)在就不會被嚴重地污染了。根據(jù)句意選B。
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