题目

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：C 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。

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