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I could have called you for help, but I ____ your number.  
A.couldn’t rememberB.didn’t remember
C.should have rememberedD.hadn’t remembered
B
could have done 表示过去本可以做某事而没有,是一个与过去事实相反的虚拟语气,but后引出了一个过去事实,说明不能做的理由。故remember用一般过去时。
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