If powerful measures _______, this area would have been badly polluted.A、aren’t

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问题 If powerful measures _______, this area would have been badly polluted.

选项 A、aren’t taken
B、haven’t been taken
C、weren’t taken
D、hadn’t been taken

答案 D

解析考查虚拟语气。由主句的时态would have been可看出，这是对过去情况的描述，且与过去事实相反，实际上过去已经采取了措施，故此处用过去完成时表示对过去的虚拟，答案为D。

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Ifpowerfulmeasures_______,thisareawouldhavebeenbadlypolluted.A、aren’t