问两题GWD的答案和OG不同

这题大全给的答案和老管都是C,  (老管的理由是on ... poles or equator 不对, 应该是at 在两极或赤道上. )

但 OG 11th SC 给的答案竟然是A ...  究竟哪个是对的呀? ? ?

677.
   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（C）

(E) appear as dark spots on the Sun’s surface, which have never been sighted on

另一题:

Scientists have recently discovered what could be the largest and oldest living organism on Earth,

a giant fungus that is an interwoven filigree of mushrooms and rootlike tentacles spawned by a single

fertilized spore some 10,000 years ago and extending for more than 30 acres in the soil of a Michigan forest.

A extending

B extends

C extended

D it extended

E is extending

答案是A ? 为什么呢? 听老管的课说extending 和前面的spawned 并列, 应该选C才对阿?

第一题的话，我个人感觉 也是C. OG我个人觉得，偶的时候要辩证的看待。

第二题的话，extending 和前面的spawned 可以并列，现在分词表延续的状态，过分表已经存在的状态。

只是个人的观点