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If the dog hadn’t woken us, we wouldn’t have noticed the fire and it _______ to the house next door.
A.could spreadB.should have spread
C.would spreadD.might have spread
D
考查虚拟语气。此题为与过去事实相反的虚拟语气。其结构为:if +主语+ 过去完成时态,主句用would/could/might + have done,所以选D。
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