—I regret to tell you that John has been fired.
—I can hardly believe my ears. He is 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：句意：——我很遗憾地告诉你,约翰已经被解雇了。——我几乎不能相信我的耳朵。他是一个好工人。regret to do sth. 很遗憾地／抱歉地做...（事情还没有做）；regret doing sth. 很遗憾/后悔做了...（为已经做过的事而感到...）。根据句意，
故选。