Tom pretended _______ it but in fact, he knew it very well.
A.not listen toB.not to hear aboutC.not to have heard aboutD.not to be listening to在线课程C
pretend not to do为一判断依据，其二是第二句话用了knew一词，说明过去就听说了，所以采用了pretend后用不定式的完成时形式。此外，应记住：凡是非谓语的完成时形式，均表示该动作在谓语动作前发生。