54.We regret_____you that your application has not been accepted.
答案解析
解析:
regret to do sth.意为“遗憾去做某事”;regret doing sth.意为“后悔做了某事”。根据句意可知,“通知”是将要进行的动作,所以空处应用不定式形式。又因为本句中没有明显的表示时间先后顾序的词,所以应用不定式的一般式。故选B。
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