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  3. ______about it earlier, we could have warned people of the danger.

______about it earlier, we could have warned people of the danger.

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问题 ______about it earlier, we could have warned people of the danger.
选项 A、Would we know
B、Should we know
C、Have we known
D、Had we known
答案D
解析 根据句意并结合选项可知，前面的分句为省略if的非真实条件句。由主句的谓语动词could have warned可知，本句是对过去情况的假设，所以从句应用过去完成时，谓语动词应用“had+过去分词”的形式。省略if时，应将had，were，should提至主语前面。故选D。
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