问题
选择题
Henry always forgets things he has done. Yesterday he forgot__________ and looked for it everywhere.
A．to post the letter
B．to have the letter posted
C．to have posted the letter
D．having posted the letter
答案
答案：D
考查动词用法。regret后跟不定式一般式表示对即将发生的事感到遗憾，跟动名词或不定式完成式都表示对做过的事感到遗憾。选D。