前人问过，可是我有新问题要问。
196. It is possible that Native Americans originally have migrated to the Western Hemisphere over a bridge of land that once existed between Siberia and Alaska.
(A) have migrated to the Western Hemisphere over a bridge of land that once existed
(B) were migrating to the Western Hemisphere over a bridge of land that existed once
(C) migrated over a bridge of land to the Western Hemisphere that once existed
(D)migrated to the Western Hemisphere over a bridge of land that once existed
(E) were migrating to the Western Hemisphere over a bridge of land existing once
根据我的理解介词短语一般要紧跟在被修饰的词后面，否则只要前面有其他的名词就可能产生歧义。譬如OG中那个关于世界最大的历史博物馆那题。可是这题答案D介词ETS怎么不怕产生western hemisphere 在一个桥上的歧义呢？
个人认为如果要把d理解成“over a bridge of land that once existed ”是western Hemisphere的定语的话，一定要加which was，否则哪里有这么长的，还套定语从句的定语啊。
所以我觉得这个地方d是不可能产生歧义的
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