Question

We ________ our lives had it not been for the policeman.

1. A.
   would have lost
2. B.
   should lose
3. C.
   might lose
4. D.
   had lost

Answer 1

A
因为had it not been for the policeman =" if" it had not been for the policeman (如果没有警察) ，显然是与过去事实相反的情况，主句中的谓语应是would have lost。