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题目内容
（河北工程技术学院大学英语1）
38、(单选、2.5分)
________ about it earlier, we could have warned people of the danger.
A、Would we know
B、Should we know
C、Have we known
D、Had we known
________ about it earlier, we could have warned people of the danger.
A、Would we know
B、Should we know
C、Have we known
D、Had we known
参考答案
