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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 本句包含一个省略If的非真实条件句，主句谓语动词用could have warned，由此可知，从句是表示对过去发生事情的假设，从句谓语动词要用“had+过去分词”的形式。在含有had／were／should的非真实条件句中可以省略if，将had／were／should放至主语之前，构成部分倒装。故选D。
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