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20. But for the help of my teacher, I    the first prize in the Competition.

   A. would not have won  B. had not won  C. would have won      D. have won

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19. So sudden      that the enemy      no time to escape.

   A. did the attack; had               B. was the attack; had had

   C. was the attack; had              D. did the attack; had had

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18.   twice, the postman refused to deliver our letters unless we chained our dog.

   A. Being bitten     B. Bitten           C. Having bitten   D. To be bitten

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