单选题 ______, Charles Darwin did much to disprove common theories about biological evolution.
A. He was a highly respected naturalist
B. A naturalist was highly respected
C. A highly respected naturalist
D. Although a highly respected naturalist

【正确答案】 C
【答案解析】[解析] 结构识别
此句意为：作为一个非常受人尊重的自然主义者，查尔斯•达尔文做出了巨大努力来驳斥那些有关生物进化的伪科学。选项A、B都是完整句，不合题意；选项D是由although引导的让步状语从句，漏掉了he is，因此答案为C。