By the time he was 30 years old, he ________ five important inventions.


  1. A.
    had had
  2. B.
    has had
  3. C.
    had
  4. D.
    has
A
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It took 50 years for 100 million people to listen to the radio. It took 15 years for 100 million people to watch television. By the year 2000, it had taken only about three years for 100 million people to use the Internet. What will happen next on the Internet?

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