Henry always forgets things he has done. Yesterday he forgot__________ and looked for it everywhere.
A．to post the letterB．to have the letter posted
C．to have posted the letterD．having posted the letter
D
考查動(dòng)詞用法。regret后跟不定式一般式表示對(duì)即將發(fā)生的事感到遺憾，跟動(dòng)名詞或不定式完成式都表示對(duì)做過(guò)的事感到遺憾。選D。
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