旧PREP70--省略问题～～～谢谢大家了 - ChaseDream

It is unclear whether chimpanzees are unique among nonhuman species in their ability to learn behaviors from one another, or if, when other animals are studied in as much depth, similar patterns would be found.

（A) if, when other animals are studied in as much depth, similar patterns would be found
(B) if other animals were studied with as much depth they would exhibit similar patterns
(C) would similar patterns be found in other animals if they were studied in as much depth
(D) whether similar patterns would be exhibited in other animals that were studied with as much depth
(E) whether other animals would exhibit similar patterns if they were studied in as much depth

选E，但省略了if they were studied in as much depth （as chimpanzees were)
is this correct?
as much... as 也可以省略，只有一个as出现么？
我认为在比较省that of之类的情况下，是先前有类似内容出现过了，可对这题不适用呀。。。