摘要：9．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
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You ________ open the door before the train gets into the station.
A. don't have to
B. needn't
C. may not
D. mustn't
查看习题详情和答案>>You ________ open the door before the train gets into the station.
A. don't have to
B. needn't
C. may not
D. mustn't
查看习题详情和答案>>