问题补充:
If we some measures, we might have prevented the environmental pollution.
A. take
B. had taken
C. took
D. have taken
答案:
A. take
(答案→)B. had taken
C. took
D. have taken
解析:考查时态。句意:我们已经采取了措施,我们应该能阻止环境污染。条件从句中是对过去已完成动作的假设,故用过去完成时态,选B。
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