---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
网友回答
A. telling
B. having told
(答案→)C. to tell
D. to have told
解析：这题考查动词regret的用法：regret doing“后悔做了什么”，regret to do“很遗憾要做什么”，根据句意：--我很遗憾地告诉你约翰被开除了。选C。