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

試題分析：句意：這座辦公樓的集中供暖系統(tǒng)壞了，幾名工人目前正在修理。表示現(xiàn)在正在做某事，用現(xiàn)在進(jìn)行時，選D。
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