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, 有点胡涂了,答案是E,如果说A,B,C错是因为有指代不清之嫌,那为什么改成被动态就避免这个问题了呢.