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

加入错题本 分享
纠错
考题讲解

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)。

选项分析：

略、

展开显示

登录 或 注册 后可以参加讨论

查看全部7条讨论
OG2018-SC