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

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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

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

选A
语气更强烈,应该是列车员对一位乘客所说的