If the dog hadn’t woken us, we wouldn’t have noticed the fire and it to the house next door．
A. could spread
B. should have spread
C. would spread
D. might have spread
网友回答
A. could spread
B. should have spread
C. would spread
(答案→)D. might have spread
解析：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。