OG 14题，也是大全677，求教

0o小猪o0 · 发表于 2010-9-29 17:24:14

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？

0o小猪o0 · 发表于 2010-9-29 20:06:14

拜托了。。。。。

ozymendias · 发表于 2010-9-29 21:50:51

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

OG 14题，也是大全677，求教

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