题目内容
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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