【題目】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】D

【解析】句意：如果狗沒有叫醒我們，我們也就不會注意到火，它可能會蔓延到隔壁的房子。表示對過去可能性的推測，用might have spread。

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