题目内容

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

答案：D

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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