Question

(2013·陕西师大附中模拟)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

Answer 1

B

选B　句意：如果我们早采取有力措施，现在河水就不会污染这么严重。主句表示与现在事实相反的虚拟语气，用would加动词原形。