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In the late 1960s , motorcyclists in California , USA , （16 ) to go out in the countryside and ride their machines up and down mountain tracks just fo

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16. A. had been used B. has been used C. used D. was used 17. A. many B. much C. any D. some 18. A. as well B. either C. too D. as well as 19. A. was born B. is born C. were born D. are born 20. A. when B. how C. which D. where
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