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今天在刷OG的时候碰到了两题相似的v-ing结构的句子，有点想不明白，题如下。
Some anthropologists believe that the genetic homogeneity evident in the world's people is the result of a "population bottleneck"—at some time in the past our ancestors suffered an event, greatly reducing their numbers and thus our genetic variation.
(A) at some time in the past our ancestors suffered an event, greatly reducing their numbers
(B) that at some time in the past our ancestors suffered an event that greatly reduced their numbers
(C) that some time in the past our ancestors suffered an event so that their numbers were greatly reduced,
(D) some time in the past our ancestors suffered an event from which their numbers were greatly reduced
(E) some time in the past, that our ancestors suffered an event so as to reduce their numbers greatly,
A mutual fund having billions of dollars in assets will typically invest that money in hundreds of companies, rarely holding more than one percent of the shares of any particular corporation.
A. companies, rarely holding more than one percent B. companies, and it is rare to hold at least one percent or more
C. companies and rarely do they hold more than one percent
D. companies, so that they rarely hold more than one percent
E. companies; rarely do they hold one percent or more
第一题应选B，第二题应选A。
我想问的是，做这类v-ing结构的句子，从句的主语是逻辑主语吗？
第一题A选项的逻辑主语是the genetic homogeneity evident吗？第二题的逻辑主语是a mutual fund吗？
另外，第二题的B到底错在哪里，找了一遍CD论坛，也没有对B 详细的解释，另一个帖子说B错在at least 和or more上面，可我觉得错也只能错在it is rare to hold上面，不求甚解，大神帮帮忙！！
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发表于 2016-7-21 11:13:42
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有不完善的地方请大家指正
