转换法

　　转换法是解非谓语动词类题的一种有效方法。非谓语动词在句中可作定语、状语、宾语补足语，考生可以将定语从句转换为非谓语动词作定语、将状语从句转换为非谓语动词作状语、将一个单句转换为宾语补足语。

　　John has really got the job because he showed me the official letter _______ him it. （2012江西卷）

　　A. offered B. offering C. to offer D. to be offered

　　【解析】B.考查非谓语动词。此处现在分词短语作后置定语，修饰名词the official letter，构成逻辑主谓关系。不熟悉此考点的考生另可用转换法来解此题。题干可用定语从句改写成：John has really got the job because he showed me the official letter which offered him it. 其中的定语从句与现在分词短语 offering him it 同义。因此正确答案为B.offer sb sth。

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