what must we do before touching food.“must”有这样问的么?

问题描述:

what must we do before touching food.“must”有这样问的么?

可以,这样语气更强!
听听Lil' Zane
唱的What must I dowhat should we do?可以用must回答么可以,意思是必须。如果用mustn't ,意思是绝对不可以