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
考查時態(tài)。根據(jù)句意可知，工人修理窗戶發(fā)生在掉落下來之前，即過去的過去，過去完成時
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