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 |
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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 |
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