must反意疑问句的用法you must start now,____?A.mustn't you B.dont;you 选A还是选B?

问题描述:

must反意疑问句的用法
you must start now,____?
A.mustn't you B.dont;you 选A还是选B?

选A
解析:
当陈述部分含有情态动词must时,我们便要分析一下must的含义。如果must 作“一定;要;必须”讲,反意疑问句须用mustn't或needn't;而当must作推测意义“一定是;必定”讲时,反意疑问句则需根据must后的动词原形选用相应的形式。例如:
He must work hard at physics, mustn't he? 他必须努力学物理,是吧?
Tom must be at home,isn't he? 汤姆一定在家,是吧?

当然A了

A