选C吧
说什么新研究发现土星的光环（?）比太阳系诞生的45亿年还久.
楼下说选should的tx,我觉得should不是推测啊,表示情态什么的.
我晕,我整夜没睡觉搞论文,蒙了头了,是应该选A could,我怎么按成C了汗
could表示一种可能性,.可能比45亿年还要久,只能选could
should是应该,情态上的意味更重,would是过去式的符号,这两个都常用在虚拟语气里,但是这句话不是虚拟语气,是一种推测
36. New studies show that two of Saturns rings ______ longer
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