[求助]大全299

(A) high-paying fields like electronics and banking, making the state’s economy far more diversified than

(B) high-paying fields like electronics and banking, and making the state’s economy far more diversified than its economy

(C) high-paying fields such as electronics and banking, to make the state’s economy far more diversified than

(D) such high-paying fields as electronics and banking, making the state’s economy far more diversified than it was

(E) such high-paying fields as electronics and banking, and make the state’s economy far more diversified than it was

不太明白D中it was 是怎么补出的？than前后的比较对象应该怎么看呢？

自己总是找不准确，所以补不出来，请NN们帮帮偶~~

(D) such high-paying fields as electronics and banking, making the state’s economy far more diversified than it was

it 指代 the state's economy ， 比较的对象是发生变化的经济和十年前的经济相比