问题补充:
Tom pretended it;but in fact,he knew it very well.
A. not to listen to
B. not to hear about
C. not to have heard about
D. not to be listening to
答案:
A. not to listen to
B. not to hear about
(答案→)C. not to have heard about
D. not to be listening to
解析:pretend not to have done假装没做过某事;pretend to be doing sth.假装正在做某事;pretend to do sth.假装做某事。由he knew it very well可知,应选C项。