The central heating system of this office building is down and several workers _
题型：不详难度：来源：
The central heating system of this office building is down and several workers ______ it right now.| A．had repaired | B．have repaired | C．repaired | D． are repairing |
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答案
| D |
解析
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。 |
举一反三
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