Once fighting broke out between the two villages and many为什么要用broke out 而不用had broken out

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Once fighting broke out between the two villages and many为什么要用broke out 而不用had broken out

Once fighting broke out between the two villages and many为什么要用broke out 而不用had broken out
Once fighting broke out between the two villages and many
为什么要用broke out 而不用had broken out

Once fighting broke out between the two villages and many为什么要用broke out 而不用had broken out
我们用一般过去时,因为Once ==at one time in the past,有了in the past 或者once(以前有段时间),句子的谓语动词就必须是一般过去时.

应该都可以 因为没有给出特定的时间