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   medicine works in a human body is a question    not everyone can understand fully.

A.How;that    B.That;which   C.What;which   D.What;that

 

A

how在句中引导主语从句;that引导定语从句,修饰限定question。句意为:药物是如何作用于人体的,这个问题并不是每个人都能完全理解的。

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