(2013·陜西師大附中模擬)If we had taken such effective measures much earlier, the river ________ so seriously now.

Ais not polluted

Bwould not be polluted

Chad not been polluted

Dwould not have been polluted

 

B

【解析】B 句意:如果我們早采取有力措施,現(xiàn)在河水就不會(huì)污染這么嚴(yán)重。主句表示與現(xiàn)在事實(shí)相反的虛擬語氣,用would加動(dòng)詞原形。

 

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