You ( )to the meeting this afternoon if you have something important to do.A needn't to come B don'tneed come C don't need coming D needn't come 为什么不能选A

You ( )to the meeting this afternoon if you have something important to do.A needn't to come B don'tneed come C don't need coming D needn't come 为什么不能选A
You ( )to the meeting this afternoon if you have something important to do.
A needn't to come B don'tneed come C don't need coming D needn't come 为什么不能选A

You ( )to the meeting this afternoon if you have something important to do.A needn't to come B don'tneed come C don't need coming D needn't come 为什么不能选A
答案：D needn't come
1.need做情态动词时,否定式是needn't do （needn't+原形动词）
.2.need做行为动词用时,否定式是 don't（doesn't/didn't……） need to do （助动词的否定式+ need to do ）
不管它是作为情态动词还是行为动词,其否定式都不会是 needn't to do ,所以A needn't to come 是不存在的

D
need 作为情态动词来用时，后面要接动词原形

因为当need译为必要的时候是情态动词，它的否定式为needn't，译为没有必要，情态动词后面直接加动词come

needn't只能够用于否定回答当中
比如No,you needn't.