Having worked on this invention for over a year now.I am confident that I will find a solution．题目和参考答案——青夏教育精英家教网—

2．Having worked （work） on this invention for over a year now，I am confident that I will find a solution．

分析在致力于这些发明一年多后，我自信我会找到解决方法．

解答答案是Having worked．本题考查现在分词完成式；逗号前面为分词做状语；分词做状语时分词的选择是看分词和句子主语之间的关系；本题中分词和句子主语之间是主动关系；故用现在分词；现在分完成式强调先后关系，强调分词的动作在谓语动词之前；本题中强调"经过一年多的努力之后变得自信"，故用完成式Having worked．

点评本题是要求用所给动词的适当形式填空，解题时首先考虑句中需要的是谓语动词还是非谓语动词；其次，如果是谓语动词关注时态、语态和数的变化；如果是非谓语动词要联系非谓语的基本用法判断非谓语的形式．

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