excuse me ,sir.you __open the door before the train stops .

分类: 作业答案 • 2021-11-12 22:17:57

问题描述：

excuse me ,sir.you __open the door before the train stops .
A.mustn't B.needn't C.may not D.don't have to

答

A
仍然是严厉禁止,语气严厉
MUSN'T 表示严厉禁止,但是不能表推测