摘要: You open the door before the train gets into the station. A. don’t have to B. mustn’t C. needn’t D. may not [解析]答案:B.该题考查的是几个情态动词否定式的用法区别.don’t have to和needn’t的意思都是“不必 .may not的意思是“可以不 .只有mustn’t表示“不许 .“禁止 . [满分演练]
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