Tom pretendedit but in fact he knew it very well.A. not listen toB. not to hear aboutC. no

问题补充：

Tom pretendedit 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

答案：

A. not listen to

B. not to hear about

(答案→)C. not to have heard about

D. not to be listening to

解析：此处用不定式的完成式表示该动作发生在前。