China has many rivers, ____the Changjiang River is the longe

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China has many rivers, ____the Changjiang River is the longest. A.which B.in which
C.among which D.on of which 答案是C,请问为什么不选B或D?

这里是非限制性定语从句的关系代词的用法.由于the Changjiang River 属于中国很多条河中的一条,用介词among 表示三者以上的其中一个是非常合适的,而which就指代many rivers,由于关系代词的用法,这里就用among which了,in 或out of which表示三者以上其中之一都不太合适.
再问：但in:字典释义：contained in ; forming the whole or part of sth.包括在…之内；构成整体或部分。这样理解的话，in which 也可以选择啊
再答：根据汉语解释的意思看似是可以，中国的河流有很多，但这并不能组成任何的整体啊，而是独立的一个个河流嘛。如果说这些河流组成一个比如说像太阳和其他星球组成一个“太阳系”，他是其中一个，那么用In是可以的。你理解下意思。

China has many rivers, ____the Changjiang River is the longe china has many rivers,theyangtze river is the longest Changjiang River is one of the longest rivers in China.为什么要用可以是ChangJiang is the first longest rivers in China The longest river in China is the Changjiang River. the Changjiang River is the ( ) river in China The river in China is the Changjiang River The Changjiang River is the___________longest river in China The Changjiang River is one of the longest rivers in the wor The l____river in China is the Changjiang River. The Changjiang River is one of ____longest rivers in the wor The Changjiang River is one of_(long)rivers in the world.