(2013·陜西師大附中模擬)If we had taken such effective measures much earlier, the river ________ so seriously now.
A．is not polluted
B．would not be polluted
C．had not been polluted
D．would not have been polluted
B
選B　句意：如果我們早采取有力措施，現(xiàn)在河水就不會污染這么嚴(yán)重。主句表示與現(xiàn)在事實相反的虛擬語氣，用would加動詞原形。
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