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15．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

分析 救護車剛剛過來了，因為一個工人在修理二樓的窗戶時掉下來了．

解答 答案：A
根據題干中"fell off the window"可判斷該句的整體時態為過去式，由于"修理窗戶"這個動作應在"掉下"之前發生，故應使用過去完成時，因"修理窗戶"這個動作在那個時間段是一直進行的并且對現在產生了直接影響，故使用了進行時，故正確選項為過去完成進行時，答案為A．

點評 本題考查過去完成進行時的用法，應注意各時態的基本用法，根據句意推斷出所用時態選出正確選項．

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