[求助]请问444(OG196)

bipedalism

444.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

此题选D,我选的A.
想请教大家,为什么这道题要用一般过去时而不用现在完成时呢??

solome

过去完成时是过去发生的持续到现在的，Native Americans originally have migrated ...
显然是不对的，这个是在讲Native Americans 是...来迁移的，注意originally。
这个应该是在讲一个历史的背景资料

bipedalism

想通了,谢谢

祝英台

请问

D里的that是修饰 bridge还是修饰land？

E中的land existing once怎么就imprecise?

简禾

以下是引用祝英台在2008/4/11 10:19:00的发言：

请问

D里的that是修饰 bridge还是修饰land？

E中的land existing once怎么就imprecise?

D应该修饰的是BRIDGE吧

E我也不确定，是不是应该做伴随状语呀

如果伴随状语在句尾的话，有两种情况，1是伴随动作，状态，功能，逻辑主语为句子主语

2是表伴随结果，逻辑主语为前面整句话，

我觉得这两种情况都不符合呢