OG14

shirleyyamap

  14.   Sunspots, vortices of gasassociated 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 thesurface of the
Sun but have never been sighted on
(B)         are visible as dark spots thatnever have been
sighted on the surface of the Sun
(0  appear on the surface of the Sun as dark spots
although never sighted at
(D)         appear as dark spots on the surfaceof the Sun,
although never having been sighted at
(E)          appear as dark spots on the Sun'ssurface,
which have never been sighted on



CD选项中although是否一定加完整句？官方解释说少了主语且没有动词，那也就是说although要加完整句，但verbal分册中36题正确答案Although eradicated in the US, polop continues ……中although后面加的不是完整句，所以不清楚什么时候加完整句什么时候不加完整句。

另外，E选项which是否有修饰歧义？which应该是可以跳跃修饰的，在A 介词 B，which中which是修饰A的，应该不会有歧义，但是OG解释说awkard and unclear

zhengjiahan

we shall not just focus on E. the entire sentence aims at expressing the contrast, while E is not as apparent as A in this point.