Sentence Correction
试题详情
题目：
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.
选项:
A、as not a single substance, but it is rather a biological family of complex molecules that play
B、as not a single substance but as a biological family of complex molecules playing
C、not as a single substance but as a biological family of complex molecules that play
D、not to be a single substance but rather a biological family of complex molecules playing
E、not as a single substance but instead as being a biological family of complex molecules that play
答案:
C
