补充19-4，V-ED可以和v直接并列？

qiqi_cola

4.    Sunspots, vortices of gas associated with strong electro-magnetic 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

gemj

associated with strong electro-magnetic是作定语，修饰vortices of gas，并非与appear并列。
你说的是这个吗？

qiqi_cola

楼上的，我说的是APPEAR和ALTHOUGH NEVER SIGHTED