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    19．Jack pretendednot to know（know） everything about it and said nothing．

    分析 Jack假装不知道关于它的一切，什么都没说．

    解答 答案是not to know．考查词组pretend to do sth．假装做某事，否定形式是pretend not to do sth．假装不做某事．句意是：Jack假装不知道关于它的一切，什么都没说．故答案是not to know．

    点评 解答此类题目，首先需要明确句意，然后确定考查的相关语法和固定搭配，填写正确的答案．

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