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

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