Question

I regret ____you that we are unable to offer you employment

1. A.
   informing
2. B.
   having informed
3. C.
   to inform
4. D.
   to have informed

Answer 1

C
解析：
考查regret的用法：regret doing后悔做過…,regret to do很遺憾要做…,句意是：我遺憾的通知你我們不能雇傭你。選C。