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    精英家教网 > 高中英语 > 题目详情
    The central heating system of this office building is down and several workers ______ it right now.
    A．had repairedB．have repairedC．repairedD． are repairing
    D

    试题分析：句意：这座办公楼的集中供暖系统坏了，几名工人目前正在修理。表示现在正在做某事，用现在进行时，选D。
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