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英语大神在哪里owing to the unexpected difficulties on the part of t

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英语大神在哪里
owing to the unexpected difficulties on the part of the supplies ,we regret ____to ship the goods within the time limit of your letter of credit
A be unable B to be unable C being unable D to have been unable
C being unable,表示 “没能按时送达” 的意思.
再问: 为什么不选B
再答: 两个的区别: regret to do sth. 很遗憾地/抱歉地做...(事情还没有做) I regret to tell you that you can't pass the examination.我很遗憾地通知你你不能通过这次考试. regret doing sth. 很遗憾/后悔做了...(为已经做过的事而感到...) I regret disturbing yo so long.我很抱歉打扰了你那么久 这句话我个人觉得是说,由于.....原因,货物没能按时送达,所以选C。