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The water supply has been cut off temporarily because the workers________one of the main pipes.                                                     (2013·天津,13)
A.had repairedB.have repaired
C.repairedD.are repairing
D

考查动词时态。句意为:水供应已暂时被切断,因为工人们正在维修其中一个主管道。根据has been cut off判断应该是现在的某种时态。再根据时间状语temporarily可以判断出repair是现在正在发生的动作,故用现在进行时。
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