-She _____. I've already borrowed one. (湖南 2005)

A. can't B. mustn't C. needn't D. shouldn't (答案：C。)

分析： needn't 表示"没有必要"。根据所提供的情景I've already borrowed one.可判断出没有必要再借给我词典。need既可以作情态动词又可以作行为动词。作情态动词常用于否定句和疑问句。作行为动词时，后接不定式表示需要做某事；后接动词-ing形式表示"需要被做"，等于need to be done。例如：

The house needs cleaning.

= The house needs to be cleaned.