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    The biggest problem for most plants,which_______just get up and run away when threatened,is that animals like to eat them.
    A．shan’tB．can’t
    C．needn’tD．mustn’t
    B
    can’t意为“不能”。根据常识可判断出植物不会站起来和逃跑。故选B项。shan’t 是shall的否定形式,作情态动词在陈述句中用于第二人称或第三人称,表示说话者的意志、命令、约定、决心、警告、威胁、预言等,意为“不应该,不要”。needn’t 意为“不需要”。mustn’t 意为“不准,禁止”。
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