标题: OG 14题，也是大全677，求教 [打印本页] 作者: 0o小猪o0 时间: 2010-9-29 17:24 标题: OG 14题，也是大全677，求教 Sunspots, vortices of gas associated with strong electromagnetic activity, are visible as dark spots on the surface of the Sun but have never been sighted on the Sun’s poles or equator.(A) are visible as dark spots on the surface of the Sun but have never been sighted on (B) are visible as dark spots that never have been sighted on the surface of the Sun (C) appear on the surface of the Sun as dark spots although never sighted at (D) appear as dark spots on the surface of the Sun, although never having been sighted at (E) appear as dark spots on the Sun’s surface, which have never been sighted on 选A。想请教，C是因为although后面应该加句子错的吗？但这里although是不带逗号的，那主语是不是可以像but一样是可以省略的呢？作者: 0o小猪o0 时间: 2010-9-29 20:06
拜托了。。。。。作者: ozymendias 时间: 2010-9-29 21:50
恩 这是个历来纠结的问题 lz不妨搜索搜索，基本上都有讨论过 http://forum.chasedream.com/GMAT_SC/thread-379675-2-1.html