【SAT文法】这句话为什么不用完成时?

【SAT文法】这句话为什么不用完成时?
When we counted the growth rings in the ancient redwood stumps,we found that the life of each of these trees spanned many centuries of history.
为什么不用had spanned?如果都对的话区别是什么?
1235892 1年前 已收到1个回答 举报

yuhao198125 幼苗

共回答了17个问题采纳率:88.2% 举报

had spanned用 有明确时间先后顺序的时候,eg.I had done my homework before the lunch was served.

1年前

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