OG 210 平行问题求教

sunjueliang

题和OG解释如下。我想问可不可以这样考虑而选B: a giant fungus that is...and (that) extends...
自己给想了两个不选B的理由，不知道哪个更充分些:
1.定语丛句并列,前面有that的后面的that不能省
2.就意思方面的考虑。修饰tentacles更好?和spawned by a single...对照更好？

谢谢

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
Choice A, the best answer, preserves grammatical parallelism while allowing for logical expression of temporal relationships; A employs the parallel participial phrases spawned... and extending ... to modify filigree. Other choices present different grammatical constructions that are not participial modifiers and thus not parallel to spawned: extends in B is a present-tense verb; it extended in D begins a new clause; and is extending in E ungrammatically introduces a new predicate. In C, extended is nonparallel if it is assumed to be a past tense verb form; if it is assumed to be a past participle, it illogically states, as does D, that the filigree extended only in the past.