My cat would not have bitten the toy fish______it was made of rubber.A、if she ha

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问题 My cat would not have bitten the toy fish______it was made of rubber.

选项 A、if she has known
B、if she knew
C、she should have known
D、had she known

答案 D

解析虚拟语气。if引导的非真实性条件状语从句，表达与过去事实相反的假设情况时，从句动词结构使用过去完成时，主句动词使用would+have done。

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Mycatwouldnothavebittenthetoyfish______itwasmadeofrubber.A、ifsheha