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(hù)車剛剛過(guò)來(lái)了，因?yàn)橐粋�(gè)工人在修理二樓的窗戶時(shí)掉下來(lái)了．

解答 答案：A
根據(jù)題干中"fell off the window"可判斷該句的整體時(shí)態(tài)為過(guò)去式，由于"修理窗戶"這個(gè)動(dòng)作應(yīng)在"掉下"之前發(fā)生，故應(yīng)使用過(guò)去完成時(shí)，因"修理窗戶"這個(gè)動(dòng)作在那個(gè)時(shí)間段是一直進(jìn)行的并且對(duì)現(xiàn)在產(chǎn)生了直接影響，故使用了進(jìn)行時(shí)，故正確選項(xiàng)為過(guò)去完成進(jìn)行時(shí)，答案為A．

點(diǎn)評(píng) 本題考查過(guò)去完成進(jìn)行時(shí)的用法，應(yīng)注意各時(shí)態(tài)的基本用法，根據(jù)句意推斷出所用時(shí)態(tài)選出正確選項(xiàng)．

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