Recently documented examples of neurogenesis, the production of new brain cells, include the brain growing in mice when placed in a stimulating environment or neurons increasing in canaries that learn new songs. (D) the brain growth in mice when placed in a stimulating environment or the increase in canaries' neurons when they (E) brain growth in mice that are placed in a stimulating environment or an increase in neurons in canaries that 答案是E。 解释说D中的when placed修饰了documented examples导致逻辑意思错误。 但是when placed 不是靠近mice的吗？修饰mice逻辑意思没错呀，而且还比E的定语从句简介。 这到底是为什么呢？ -- by 会员 bobo1990 (2010/9/13 13:34:29)
when S + V 是状语从句只能修饰谓语，因此只能往前修饰到include而无从修饰名词。
此外，when placed省略的主语必然是共用主要从句的主语，因此when placed in a stimulating environment的主语是Recently documented examples而不会是mice。 | 
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发表于 2010-9-13 13:34:29
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