题目内容

20．The water supply has been cut off temporarily because the workers _______ one of the main pipes．（　　）
A．had repairedB．have repairedC．repairedD．are repairing

分析 句意：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．

解答 答案D
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，应用现在进行时．故选D项．

点评 考查时态．可以根据时间状语或主从句的时态一致原则判断．

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