此句中been是什么意思,省去意思有什么不同?Thanks for your help; it's been very valuable

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此句中been是什么意思,省去意思有什么不同?Thanksforyourhelp;it''sbeenveryvaluable此句中been是什么意思,省去意思有什么不同?Thanksforyourhel

此句中been是什么意思,省去意思有什么不同?Thanks for your help; it's been very valuable
此句中been是什么意思,省去意思有什么不同?
Thanks for your help; it's been very valuable

此句中been是什么意思,省去意思有什么不同?Thanks for your help; it's been very valuable
这里这个用法用it's been或者it has been比起it is这个用法,更能体现时间的持续性,表示这段时间内你的帮助一直很有用.省去的话,意思差不多,只不过在强调时间段上没有那么时间长.

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