Dogs ________ men's friends for millions of years．Early men ________ them for hunting．


  1. A.
    were; helped
  2. B.
    have been; helped
  3. C.
    were; used
  4. D.
    have been; used
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Dogs ________ men's friends for millions of years．Early men ________ them for hunting．

[　　]

A．were; helped

B．have been; helped

C．were; used

D．have been; used

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