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    19．The order from the commander was that the troops should setout/off for the front immediately．

    分析 指挥官的命令是部队应该立即开往前线．

    解答 答案是out/off．
    本题考查语境中选用恰当的词的适当形式．set out/off for"出发去某地"，根据语境，部队"开往前线"，故答案是out/off．

    点评 单词填空必须在对语境整体理解的基础上抓住指向答案的关键线索、固定句型或搭配等，同时注意所选词的形式变化．

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