how long will I (be off work)?A:need not stay at work C:am not to go to work 为什么不是C.

问题描述:

how long will I (be off work)?A:need not stay at work C:am not to go to work 为什么不是C.

will是助动词,后面要接动词的原型,need是动词原型,而am不是.