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________did you surf the Internet this week? Three times.


  1. A.
    How
  2. B.
    How old
  3. C.
    How often
  4. D.
    How many times
D
根據后文答語內容,可知答案為D,用how often,表示多久一次,故選D
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"What time is it?" Then people can tell me the exact time.But before the invention of clocks, it was
very difficult.One way people told the time was by using sundials, but it was impossible to tell the time
on cloudy days or at night.
     The first mechanical(計時)clock was invented in China by Su Sung in 1088.The first clock in
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