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______about it earlier,we could have warned people of the danger.
______about it earlier,we could have warned people of the danger.
admin
2015-03-19
52
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
句意:如果我们早点知道的话,就会警告人们有危险发生。本句为虚拟语气结构,主句为could have warned引导的现在完成时态,从句要用过去完成时态had done的形式。在if省略的条件下,虚拟条件句中的从句部分要将助动词had放到主语之前,进行倒装。因此本题选D。
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