86OG-11（CD22-16)以前没讨论过，请大家忙我解释一下

16. 86 OG-11

        The growth of the railroads led to the abolition of local times, which was determined by when the sun reached the observer’s meridian and differing from city to city, and to the establishment of regional times.

(A) which was determined by when the sun reached the observer’s meridian and differing

(B) which was determined by when the sun reached the observer’s meridian and which differed

(C) which were determined by when the sun reached the observer’s meridian and differing

(D) determined by when the sun reached the observer’s meridian and differed

(E) determined by when the sun reached the observer’s meridian and differing

答案是E,不知道C错在哪里，这里不可以用WHICH吗？

(B) which was determined by when the sun reached the observer’s meridian and which differed （was错，wordy）

(C) which were determined by when the sun reached the observer’s meridian and differing (differing无平行对象)

(D) determined by when the sun reached the observer’s meridian and differed(differed 无平行对象)

(E) determined by when the sun reached the observer’s meridian and differing（correct,非谓语动词的平行，determined被动）differing主动

 类似地还有

(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.

Thank you, I got it.