问题补充:
I regret you that we are unable to offer you a job.
A. informing
B. having informed
C. to inform
D. to informing
答案:
A. informing
B. having informed
(答案→)C. to inform
D. to informing
解析:regret to say/inform/tell表示很遗憾……,近似于Im sorry to say. regret doing表示对发生的事后悔,懊悔或惋惜。