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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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