Researchers now regard interferon as not a single substance, but it is rather a biological family of complex molecules that play an important, though not entirely defined, role in the immune system.


as not a single substance, but it is rather a biological family of complex molecules that play

as not a single substance but as a biological family of complex molecules playing

not as a single substance but as a biological family of complex molecules that play

not to be a single substance but rather a biological family of complex molecules playing

not as a single substance but instead as being a biological family of complex molecules that play

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题目分析：
本题十分简单，只要知道not...but...是平行触发语，连接两者需保证在语法和逻辑上的平行即可成功解题。答案为(C)。

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