问题
选择题
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
答案
答案：D
题目分析：句意：如果狗没有叫醒我们，我们就不会注意到火，它可能已经蔓延到隔壁家去了。对过去情况进行虚拟，主句用would/maight/should/sould+have done。故选D。