witnessed是一般过去时,陈述过去常常发生的动作,对现在没有影响.
has witnessed是现在完成时,强调一个动作的完成性,在语境中通常表明对现在的影响.如句中,正因为last decade已经 见证了城市巨大的变化,对现在的影响就是,Linyi isn't what it used to be.
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Linyi isn't what it used to be.The last decade ___great chan
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