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We ________ our lives had it not been for the policeman.
A．would have lostB．should lose
C．might loseD．had lost
A
因為had it not been for the policeman =" if" it had not been for the policeman (如果沒有警察) ，顯然是與過去事實相反的情況，主句中的謂語應是would have lost。
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