skim wrote:
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 Sunbut have never been sighted on
(B) are visible as dark spotsthat never have been sighted on the surface of the Sun (meaning change - sunspots are visible indeed.)
(C) appearon the surface of the Sun as dark spots although never sighted at
(D) appear
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