这个是现在完成时 过去发生的事对现在的影响 for加一段时间是标志 过去几百年来 也就是一直到现在
关于has been和have been用法的
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相关问题
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have has had或 having +been 的区别和用法
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has been的用法has been的用法
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there have been 和there has been
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has been / have been /had been …………
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