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15. Recently documented examples of neurogenesis（神经形成）, 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.
A. the brain growing in mice when placed in a stimulating environment or neurons increasing in canaries that B. mice whose brains grow when they are placed in a stimulating environment or canaries whose neurons increase when they C. mice's brains that grow when they are placed in a stimulating environment or canaries' neurons that increase when they 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
A: when placed的逻辑主语是production而不是邻近的mice，句意错；动名词growing和increasing应该改成名词growth，increase B: they指代不明，可以指代brains或mice；第二个they和第一个they不是一个对象 C: they指代brains不对；第二个they和第一个they不是一个对象 D: when placed的逻辑主语是production而不是邻近的mice，句意错； E: correct
终于搞清楚了答案是E，可是就是不明白为什么主句主语是production, 我觉得主句主语应该是document examples, production是同位语呀。 且谓语动词又是复数形式。所有主句主语应该是documented examples呀。求帮忙，晕死了！！！！！！！！！！！
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发表于 2007-6-8 06:58:00
楼主
但是有when placed这种说法，可以看成省略了时间状语从句的主语啊
