Question

If the dog hadn’t woken us, we wouldn’t have noticed the fire and it _______ to the house next door．

1. A.
   could spread
2. B.
   should have spread
3. C.
   would spread
4. D.
   might have spread

Answer 1

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。