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
考查時(shí)態(tài)。根據(jù)句意可知，工人修理窗戶發(fā)生在掉落下來(lái)之前，即過(guò)去的過(guò)去，過(guò)去完成時(shí)
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