请教

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 difering 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，请问为什么A不可以

For all his professed disdain of such activities, Auden was an inveterate literacy gossip.

a) for all his professed disdain of such activities

b) Having always professed disdian for such activities

c) all such activities were, he professed disdained and

d) professing that all such activities were disained

e) In spite of professions of disdaining all such activities

答案为什么是A呢？

In choice A, was is incorrect; the verb must be were to agree with times. Also, which becomes the subject of a compound verb that lacks parallelism: was determined…and differing. In choice B, was is again incorrect, and the use of two which clauses is awkward. In choice C, which were determined…and differing is another faulty compound verb. Choice D presents a false compound: determined is an adjective modifying local times and differed is the simple past tense of to differ. Because they serve different grammatical functions, these words cannot be treated as parallel elements joined by and. Choice E is best: without which, determined and differing function not as verb elements but as parallel modifiers of local times. This question is very difficult.

2.Choice A is correct and idiomatically phrased. Choice B fails to express the sense that Auden indulged in literary gossip despite professing disdain for it. Choices C, D, and E do not establish precisely that Auden was the one professing disdain for literary gossip. The and in C makes the disembodied professions of disdain and the indulgence in gossip seem like wholly separate matters, and E is especially awkward. The question is of middle difficulty.