[語文] PP97SC---我想知道they代替誰??

[boyacute (修法文的自然組)]

  (29753-!-item-!-188;#058&003991)

Industrialization and modern methods of insect control have improved the
standard of living around the globe while at the same time they have
                                    --------------------------------
introduced some 100,000 dangerous chemical pollutants, having gone virtually
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unregulated since they were developed more than 50 years ago.

(A) while at the same time they have introduced some 100,000 dangerous
chemical pollutants, having
(B) while at the same time introducing some 100,000 dangerous chemical
pollutants that have
(C) while they have introduced some 100,000 dangerous chemical pollutants at
the same time, which have
(D) but introducing some 100,000 dangerous chemical pollutants at the same
time that have
(E) but at the same time introducing some 100,000 dangerous chemical
pollutants, having


雖然不是考點
但我看不大出來since後面的they是指Industrialization and modern
還是chemical pollutants
有人說代名詞要代最近的
有老人說代名詞優先代替主詞

請指教
謝謝




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→ toothache:看句意, they指的是mothods
推 cynt:我覺得是chemical pollutants
推 cynt:原句有兩個they會造成混淆 所以改成正確答案B
→ cynt:就不會有這個問題
推 PINKENVI:恩，我也覺得是chemical pollutants!