-Can we ski on this mountain?

问题描述:

-Can we ski on this mountain?
-Of course .Hover ,at no time ___you do alone.
Acould B might C need D must 选D
为什么啊

这个句子否定前置,并倒装,要表达的意思是无论何时,你绝对不可以单独去滑雪,禁止某人做某种,情态动词用must
用正常句子说 you mustn't do alone at any time.