Australian embryologists have found evidence that suggests that the elephant is descended from an aquatic animal, and its trunk originally evolved as a kind of snorkel.
(a)..
(b) that has suggested the elephant descended from an aquatic animal, its trunk originally evolving
(c)suggesting that the elephant had descended from an aquatic animal with its trunk originally evolving
(d) to suggest that the elephant had descended from an aquatic animal and its trunk originally evolving
(e) to suggest that the elephant is descended from an aquatic animal and that its trunk originally evolved
答案是A
对于C的解释有点不理解：
prep语法笔记上说：with部分结构错误
这是错在哪了？独立主格不是可以的吗？
表伴随时，既可用分词的独立结构，也可用with的复合结构。
with +名词(代词)+现在分词/过去分词/形容词/副词/不定式/介词短语 | 
