过去时与现在完成时这是纽约时报上的一句话.It remained a mystery why Zhao Zuohai confessed,and whose body was found in the well.此句时态为什么不用完成时?

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过去时与现在完成时这是纽约时报上的一句话.It remained a mystery why Zhao Zuohai confessed,and whose body was found in the well.此句时态为什么不用完成时?
过去时与现在完成时
这是纽约时报上的一句话.It remained a mystery why Zhao Zuohai confessed,and whose body was found in the well.此句时态为什么不用完成时?

过去时与现在完成时这是纽约时报上的一句话.It remained a mystery why Zhao Zuohai confessed,and whose body was found in the well.此句时态为什么不用完成时?
简单的陈述性语句现在完成时与一般过去不必分得太差异.一般说来,简单陈述更倾向于一般过去,现在完成时强调一点对现在的影响

这只是陈述过去的事情,应该用一般过去式。当强调过去的事情已经完成或对现在有影响时,才需要完成时。比如,it has remained a mystery ever since it happened (自从发生以后,它一直是个谜).