We regret you that we have offered the job to someone else. A. tellB. tellingC. told D. t

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A. tell
B. telling
C. told
(答案→)D. to tell
解析：考察regret的用法。Regret doing sth 后悔干了某事 regret to do sth 很遗憾去干某事
句意为，我很遗憾的告诉你，我们已经把这个工作给别人了。