We tramped through the wood for over two hours until we arrived at a deep stream.for over two hours 不是一段时音吗,为什么用过去时,

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Wetrampedthroughthewoodforovertwohoursuntilwearrivedatadeepstream.forovertwohours不是一段时音吗,为什么用过去时,Wet

We tramped through the wood for over two hours until we arrived at a deep stream.for over two hours 不是一段时音吗,为什么用过去时,
We tramped through the wood for over two hours until we arrived at a deep stream.
for over two hours 不是一段时音吗,为什么用过去时,

We tramped through the wood for over two hours until we arrived at a deep stream.for over two hours 不是一段时音吗,为什么用过去时,
因为until后面用的过去式,如果前面用现在完成时的话,还是属于广义的现在时的范畴,所以,用过去式