题目内容

The ambulance was just arriving, for a worker, who ______ the window on the second floor, fell off the window.
A．had been repairingB．was repairing
C．has been repairingD．would be repairing
A
考查时态。根据句意可知，工人修理窗户发生在掉落下来之前，即过去的过去，过去完成时
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