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
考查虛擬語氣。此題為與過去事實(shí)相反的虛擬語氣。其結(jié)構(gòu)為：if +主語+ 過去完成時(shí)態(tài)，主句用would/could/might + have done，所以選D。
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