题目内容
15.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 |
分析 对不起,先生.在火车停下来前你不可以开门.
解答 答案:A.mustn't不可以,明令禁止;needn't不必;may not不可以;don't have to不必.根据 before the train stops,可知在火车停下来前你不可以开门的,这是规定,明令禁止做的事.mustn't不可以,明令禁止.故选A.
点评 本题考查了情态动词的用法.解答时注意理解句意以及所给选项的意思并作出正确选择.
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