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i ( ) you ,but i didn`t think you would listen to me.A could

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i ( ) you ,but i didn`t think you would listen to me.A could have told ,B must have told ,C should
该选哪一个?为什么不选B
i ( )C you ,but i didn`t think you would listen to me.
A could have told ,B must have told ,C should have told
再问: C是should tell D是might tell答案给的是A
再答: 那就是A了,C就肯定不对了 这考察的是虚拟语气,could have done本已经做了