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
选项E里的exising OG的解释说imprecise,这里为什么用that 从句而不用分词短语,怎么就imprecise了,木看出来?
还有D里的that是修饰 land呢还是bridge 呢? |