Firemen ______(已经同森林大火搏斗了将近3个星期) before they could get it under control.had been

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问题 Firemen ______(已经同森林大火搏斗了将近3个星期) before they could get it under control.

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答案 had been fighting the forest fire for nearly three weeks

解析本题考查过去完成进行时态，表示过去某一时刻之前一直进行的动作。根据后半句before they could…可知．在控制住火势之前他们一直在与大火搏斗，因此此处应用过去完成进行时；“搏斗”可用动词fight表示。

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