—You were brave enough to raise objections at the meeting.
— Well, now I regret ________ that.
A、todoD
regret后所跟动词有todo与doing两种形式，不定式表示“为做某事而遗憾”，doing表示“为做过某事而后悔”。“havingdone”则更强调动作已发生而无法挽回。
—Youwerebraveenoughtoraiseobjectionsatthemeeting.
—Well,nowIregret________that.
Peopleappreciate_______withhimbecauseheisknowledgeableandhumorous.
Thetrafficwasheldupformorethanthirtyminutes,________causedmetoarrivelate.
Thechallengeisnotoneofexpansion._______,therapidgrowthinenrollmentoverthelast40yearshascometoanend.
Importswillbeallowedinproportion_______exports.
