I regret you that we are unable to offer you employment.A. informingB. having informedC. t

问题补充：

I regret you that we are unable to offer you employment.

A. informing

B. having informed

C. to inform

D. to have informed

答案：

A. informing

B. having informed

(答案→)C. to inform

D. to have informed

解析：考查regret的用法：regret doing后悔做过…,regret to do很遗憾要做…,句意是：我遗憾的通知你我们不能雇佣你。选C。