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    7．While the supplies can meet our current demand，they can，             ，last a month．（　　）
    A．at commandB．at lengthC．at randomD．at best

    分析 虽然供应能满足我们目前的需求，但它们最多可以持续一个月．

    解答 答案：D 
    考查介词短语：A．at command 可以自由使用；B．at length最后；C．at random 任意地；D．at best 至多．本句句意：虽然供应能满足我们目前的需求，但它们最多可以持续一个月．结合选项，将答案带入句中，选D．

    点评 考生平时应注意积累相应的单词和短语的用法，解答该类题时，首先要对选项用法有深刻的了解．确定它们各自不同于另外三项的用法，再结合选项，将其带入句中，一般语意逻辑通顺，即为正确答案．

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