改错:someone in the office had made a mistake,and the firm ((regretted to have casused))

改错:someone in the office had made a mistake,and the firm ((regretted to have casused))

题目
改错:someone in the office had made a mistake,and the firm ((regretted to have casused))
改错题:
someone in the office had made a mistake,and the firm ((regretted to have casused)) the customer inconvenient.
为什么括号里的错了,
答案
涉及到regret的用法:
regret doing sth.对某事感到后悔遗憾(已经发生的事)
regret to do sth.为要做的是感到后悔(动作未发生)
regret to have done将来完成时
regret having done:为做过的事感到后悔,抱歉
 
 
综上可见动作已经发生,且发生在过去,应与第四种情况吻合,故错误.
应改成regretted having accused.
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