Space exploration began in the 1960s, and since then about five hundred people    into space.


  1. A.
    have traveled
  2. B.
    traveled
  3. C.
    had traveled
  4. D.
    are traveling
A
考查時(shí)態(tài)。根據(jù)since then可知與完成時(shí)連用。故A正確。
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