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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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科目:高中英语 来源:101网校同步练习 高三英语 外语教学与研究出版社 题型:014

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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