Tom was ranked the first in his class, based on the fact that he got 98 in the exam, which is higher than anyone else's in his class.
请问这个based on 是什么状语,逻辑主语应该不是主句的主语。四种状语成分里边的哪一种?附加状语、下加状语、联加状语、外加状语? 谢谢!
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