求助(抱歉，我不知道这是哪里的题目)考过的NN战友，或者是仍在复习中的伙伴，请帮忙解答！

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

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 E is best: without which, determined and differing function not as verb elements but as parallel modifiers of local times.
    

我选的也是E。但是越仔细读解释，越是有点晕了。我的问题是——C中 which were determined…and differing is anothe faulty compound verb. 是C选项错的原因。但是原句是否可理解为 which were determinded…and （ which were） differing…which were省略，这样的话，C选项OK吗？好像也不对。因为这里是一个同位语，而which引导定语从句，我这样理解对吗？且为什么which 不可以做复合动词的主语呢？

同位语和定语从句的区别即容易混淆之处是什么？十分需要清晰、明了的解答！期待回复，非常感谢！

“因为这里是一个同位语，而which引导定语从句，我这样理解对吗？”

对的。

“且为什么which 不可以做复合动词的主语呢？”

因为which were differing是正在进行时，用在这里十分奇怪。

感谢回复！

让我由模糊到清晰！

你的意思是：E如果把省略部分还原为：(which were) determined by when the sun reached the observer’s meridian and (which)differed

没有E选项"determined by when the sun reached the observer's meridian and differing" concise. 这个我理解了，而且让我清楚了E选项还原之后与C的真正差别！

非常感谢！

结合之前easttiger回复的，我想得出有关C选项faulty compound verb 这个错误的原因。

即是：因为which were differing（进行时态）不符合原题逻辑含义，所以这里不可能理解为differing前面省略了which were.