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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
【申友解析】
正确答案：A
本句的主干是：Sunspots are visible，have never been 是后面句子的谓语。
A 选项正确
B that never have been sighted on the surface of the Sun 语意不明，并且，on the surface of the Sun the Sun’s poles or equator，这两个短语放在一起不符合语法规则，一个句子里俩主语。
C，D选型的although引导让步状语从句，但是缺少了主语和谓语
E 选项 不符合英语的表达方式
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