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 题目和参考答案——青夏教育精英家教网—

(2013·高考天津卷)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

解析

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