You _______ to the meeting today if you have something important to do.A.needn't to come B.don't need come C.don't need comingD.needn't come为什么不选A?不是need to do/don't need to

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You_______tothemeetingtodayifyouhavesomethingimportanttodo.A.needn''ttocomeB.don''tneedcomeC.don''tneed

You _______ to the meeting today if you have something important to do.A.needn't to come B.don't need come C.don't need comingD.needn't come为什么不选A?不是need to do/don't need to
You _______ to the meeting today if you have something important to do.
A.needn't to come
B.don't need come
C.don't need coming
D.needn't come
为什么不选A?不是need to do/don't need to

You _______ to the meeting today if you have something important to do.A.needn't to come B.don't need come C.don't need comingD.needn't come为什么不选A?不是need to do/don't need to
need 两个词性 1 情态动词 2 实意动词
作情态 否定need+动词原形
做实意 need to do 这里 否定是 don't need to do

need如果用needn't,那这里的need表示为情态动词,则情态动词后面不加to,所以A本身就是一个错误的形式,don't need to 里的need为动词,故,后面加to,由此排除,选D

need 当作为情态动词时,则need do something, 其否定形式是need not do something
当作为实义动词时,跟一般动词用法一样,即 need do do something, 其否定形式要借助于do, 即 don't need to do something

need在这里是情态动词,和can,must一样用法,没有时态区别、没有助动词
need也可以用作实意动词,就是一般的动词,后面加to do sth 这个时候,有时态区别,有助动词do 或者does
句子中的A后面有to说明是实意动词,那么否定应该是dont need to come

need to do /don't need to do sth need 是实义动词。否定形式借助于do
need do/needn't do need是情态动词。否定时自身接not

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