It is careless of the boyto knock my dictionary and pens onto the floor．题目和参考答案——青夏教育精英家教网—

3．It is careless of the boyto knock （knock） my dictionary and pens onto the floor．

分析男孩不小心把我的字典和笔碰到地上．

解答答案：to knock．
根据It is careless of the boy--（knock） my dictionary and pens onto the floor，可知男孩不小心把我的字典和笔碰到地上．不定式作主语的句子，it作形式主语，后跟带to的不定式作真实主语，故填：to knock．

点评本题考查用所给单词的适当形式填空，首先要根据语境明确句意，然后再根据相关语法对所给单词在形式上做出正确的变化．

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