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I know the following question has been answered in the forum but no discussion explains the query I have about E & A options. Please help.
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
请问:
C 可否理解为 although (it is ) never sighted at
E 在名词+介词短语,which 这样结构中,which指代名词吗?
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