Only when the firefighters put off the fire what great damage it caused.A.we had realizedB.had we realizedC.we realizeD.did we realize
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D解析试题分析：句意：当消防队员扑灭火的时候我们才意识到这场大火引起这么大的灾难。这里是倒装，only+状语放在句首时主句的谓语动词用部分倒装，，又因为从句用的是过去式，故主句用一般过去式，故选D。考点：考查倒装的用法。
点评：本题难度适中。倒装句是高中阶段必须掌握的语法项目，它分为部分到装和全部倒装，情况复杂，需要考生熟记它们的用法。即学即练: The girl is going to study abroad next month and when he was young.A. so her father was B. so her father didC. so was her father D. so did her father解析：D。句意：这个女孩下个月将要去国外学习。当他父亲年轻时也是这样。“so+助动词/情态动词+主语”表示一种情况也适应于另外的人。再由句子结构可知，选D。