请教语法题

supermht

210. 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
为什么答案是A

tongxun

extending 与spawned 并列

primefang

过去分词和现在分词都可以并列

jjjjjj

这里的并列是因为SUBJECT相同

samgxs

我感觉也是EXTENDING不过ETS应该不会错的吧。

tongxun

应该不会，至少这题不错。因为后面的动作是主动的。