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—Youwerebraveenoughtoraiseobjectionsatthemeeting.
—Well,nowIregret________that.
D
regret 后所跟動詞有 to do 與 doing 兩種形式，不定式表示“為做某事而遺憾”， doing 表示“為做過某事而后悔”?！?having done ”則更強調動作已發生而無法挽回。
名詞解釋：offer
Imports will be allowed in proportion _______ exports.
Thewoundedsoldierswouldrecoverquicklyiftheywerewell________.
Iwouldlove________tothepartylastnightbutIhadtoworkextrahourstofinishareport.
They built a highway _______ the mountains.
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