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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


答案:登入後觀看
難度: 計算中
1F
chennien99 (2014/09/23)
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)

13. The water supply has been cut off te..-阿摩線上測驗