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.
if, when other animals are studied in as much depth, similar patterns would be found
if other animals were studied with as much depth they would exhibit similar patterns
would similar patterns be found in other animals if they were studied in as much depth
whether similar patterns would be exhibited in other animals that were studied with as much depth
whether other animals would exhibit similar patterns if they were studied in as much depth
平行句子结构为It is unclear whether...or whether,杀掉ABC选项,D选项被动语态与第一个whether不平行,且in depth为固定搭配
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