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--- The accident might not have happened , had we been more careful .
--- But we _______.
A.didn’tB.hadn’tC.weren’tD.don’t
C
如果我们再小心一些的话事故也许不会发生。根据所给语境might not have happened可知是对过去情况的假设所以知道答语叙述的是过去的事情故选C
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