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    20. - Have you played baseball before? We need one more player.

    - ______. But I believe it will be fun to learn baseball.

    A. Sometimes　 　 B. Not really　 　　 C. Never mind　 　　　　 D. That’s cool

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    19. -Why does the Lake smell terrible?

    - Because large quantities of water　　　 .

    　 A. have polluted　　　 　　　　B. is being polluted　　

    C. have been polluted　 　　　　D. has been polluted

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