Tom pretended _______ it but in fact, he knew it very well.
A.not listen to
B.not to hear about
C.not to have heard about
D.not to be listening to
网友回答
C解析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。