Question

—You were brave enough to argue with Mr. Smith.
     —Well, now I regret _______ that.

A．to do

B．to be doing

C．to have done

D．having done

Answer 1

D

试题分析：句意：--你和斯密斯先生争论真是很勇敢。--现在我后悔这么做了。Regret表示“后悔”的时候，后面接动名词做宾语，因为是已经做过了，用动名词的完成式，所以选D。