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    精英家教网 > 高中英语 > 题目详情
    The flowers his friend gave him will die unless___every day.
    A．wateredB．watering
    C．waterD．to water
    A
    unless后接省略形式。flowers和water之间是关系要用被动语态。同时unless从句的主语与主句的主语相同，常常省略其相同成分，故选A项，表示被动。动词-ing形式表示主动；不定式常用作目的状语。
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