---I regret you John has been fired---I can hardly believe my ears．He’s such a fine worke

---I regret you John has been fired．
---I can hardly believe my ears．He’s such a fine worker．
A. telling
B. having told
C. to tell
D. to have told

A. telling B. having told (答案→)C. to tell D. to have told解析：考查固定用法。Regret to do sth 遗憾要做某事；regret doing sth 遗憾做了某事；句意：—我很遗憾的告诉你John被解雇了。—我几乎不能相信我的耳朵。他是如此好的工人。

我也是这个答案