The ambulance was just arriving, for a worker, who ______ the window on the second floor, fell off the window.
| A．had been repairing | B．was repairing |
| C．has been repairing | D．would be repairing |
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The ambulance was just arriving, for a worker, who ______ the window on the second floor, fell off the window.
| A．had been repairing | B．was repairing |
| C．has been repairing | D．would be repairing |
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