Bank of America regrets __________ you that your application for a loan has been rejected .

A) inform

B) informing

C) to inform

D) informed

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(C) 

不及物動詞 regret 用法:

1) regret + Ving    後悔曾經....

I regret telling him the truth.

2) regret to V         抱歉要......

We regret to tell you that you didn't pass the test.

=We 're sorry to tell you that you didn't pass the test.

We regret to inform you that we do not accept credit card purchases for our line of products; however, we do accept bank drafts drawn on a recognized bank.