677. 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
答案是C。可是为什么是although never sighted at, 偶觉得应该是although never been sighted at才对啊
我觉得A是意思表达最清楚的一个，原因：
1. visible as 我在OG中见过这种表达，
2. 既然有never，用完成时较好，C省的没有道理
3. at 和 on 我认为on也说得过去，何况 我觉得C有歧义
C) appear on the surface of the Sun as dark spots although never sight ed at the Sun’s poles or equator. 好像是在说没有在sun's poles or equator 看见sunspots。
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发表于 2004-7-6 22:56:00
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