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【题目】---The accident might not have happened had we been more careful.

---But we _________ at that time.

A. weren’t B. didn’t

C. hadn’t D. don’t

【答案】A

【解析】句意:----如果我们之前更认真一些,或许就不会发生这场事故了。

----但是我们那时没有认真。

根据语境,上句是对过去的虚拟,下句陈述了过去(没有认真)的事实,故用一般过去时,相当于But we weren’t careful at that time。故选A。

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