Now many children like surfing on the Internet, but ________ the same time they should know that there is something unhealthy on it．


  1. A.
    in
  2. B.
    by
  3. C.
    at
  4. D.
    on
C
解析：
at the same time是一個(gè)固定搭配，意為“同時(shí)”．
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