13. The water supply has been cut off temporarily because the workers one of the main pipes. 　　
(A) had repaired
(B) have repaired
(C) repaired
(D) are repairing

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詳解 (共 1 筆)

#1202482
句意是：水的供应要被暂时切断了，因为工人正在修理其中一个主要管道。强调动作正在进行，故选（D）
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