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a.
ad.
同義參見:
以上來源於:《英漢大辭典》
adj.
adv.
以上來源於:《簡明牛津英語詞典》
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閱讀Part1
Nationwide, air quality improved ________ from 1999 to 2003 primarily because emissions from highway vehicles decreased substantially.
(A) considered
(B) considerably
(C) considerable
(D) consideration