[語文] pp1-sc 97
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
正確答案我知道是B
但我想請問 隱約中忘記在哪裡看過
助動詞省略時候要注意時態的問題
B選項將introduced ==> introducing
時態上的差異並不會影響嗎? 還是我記錯了 只有再未來式的情況才不能省略
那為什麼又有看過省略後依舊保留原時態的呢?
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