题目内容

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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