题目内容

This big bag is too heavy for the little boy ______.Who volunteers to help him?
A．carries B．carryingC．carried D．to carry
D

试题分析：句意：携带这个大包裹对于这个小男孩来说太重。谁自愿帮助他一下？句式It is adj for sb to do sth中不定式做补足语，表示具体的动作。故选D。
点评：非谓语动词的用法比较固定，区别的主要办法一是和被修饰词的关系。一般现在分词和被修饰词是主谓关系，过去分词和被修饰词是动宾关系。二是表示动作状态的不同，现在分词表示正在进行的伴随性动作，过去分词表示发生过的被动的动作，不定式表示具体的将要进行的动作。掌握这两点，基本就能完成此类问题。
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