Several skeletons of another early whale,Basilosaurus,were found in sediments left by the Tethys

Several skeletons of another early whale,Basilosaurus,were found in sediments left by the Tethys

题目
Several skeletons of another early whale,Basilosaurus,were found in sediments left by the Tethys
Several skeletons of another early whale,Basilosaurus,werefound in sediments left bythe Tethys Sea7 and now exposed in the Sahara desert.里的sediment是状语还是表语还是其他的什么?
答案
句子貌似复杂,其实就是简单的主+系+表结构,
Several skeletons of another early whale是主语,
were+found是系动词+表语,
in sediments这一介词短语作为状语,补充说明骨架被发现时的地点状态;
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