need 用作实意动词,常用need to do sth.用作情态动词,常用need do sth.
做情态动词用时,常用于“否、疑、条（否定疑问条件）”三种句型中,不用助动词
这里 用了did’t 这个助动词,说明把need当做实意动词来用,所以后面用不定式.
另外,为了避免重复,采用了不定式的省略原则：一般情况下,省略到不定式的标志to,如此题.
求英语大师前讲来解.----Did you call Sara back?----I didn't need to,be
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