Bakeoff has found animals sometimes try not to hit or bite, especially ________ they are playing with a weaker partner．

[　　]

A．if

B．before

C．unless

D．when

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Bakeoff has found animals sometimes try not to hit or bite, especially ________ they are playing with a weaker partner．


  1. A.
    if
  2. B.
    before
  3. C.
    unless
  4. D.
    when

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