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最佳答案:yes,you can./no,you can't.yes,you must./no,you needn't.yes,you need(must)./no,yo
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最佳答案:must-Yes,you should./No,you needn't.need-Yes,you should/may/can/need./No.you nee
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最佳答案:Must I do that?Yes,you must; No,you needn'tNeed I do that?Yes,you must; No,you n