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题库 / Prep2007E1-SC-64
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.
the brain growing in mice when placed in a stimulating environment or neurons increasing in canaries that
mice whose brains grow when they are placed in a stimulating environment or canaries whose neurons increase when they
mice's brains that grow when they are placed in a stimulating environment or canaries' neurons that increase when they
the brain growth in mice when placed in a stimulating environment or the increase in canaries' neurons when they
brain growth in mice that are placed in a stimulating environment or an increase in neurons in canaries that
D选项用两个when引导的状语从句修饰the brain growth in mice和the increase in canaries' neurons ，还挺平行挺通顺的。想知道D选项哪里错了，，是when placed in a stimulating environment 缺成分吗？如果改成when they are placed in a stimulating environment 是不是就对了呢？另外，D选项里定冠词the用得不对吗？
D中最明显的错误就是你说的这个when引导的状语从句。when placed in a stimulating environment or the increase in canaries' neurons是伴随状语对吧，那么这个place的逻辑主语就只能是它最近的句子的主语啊。但逻辑上，被放在某个环境中的，肯定是mice。
一定要注意，多关心主干的变化，不要关心小词的变化。
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