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chaitanya.mehrotra
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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 equater.
(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
In the OG explanation, option C is explained to be wrong because of missing subject and verb in the subordinate clause introduced by ALTHOUGH. Can someone please clarify "Why is SIGHTED not a verb"
(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
In the OG explanation, option C is explained to be wrong because of missing subject and verb in the subordinate clause introduced by ALTHOUGH. Can someone please clarify "Why is SIGHTED not a verb"












