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 表示過去本可以做某事而沒有，是一個(gè)與過去事實(shí)相反的虛擬語氣，but后引出了一個(gè)過去事實(shí),說明不能做的理由。故remember用一般過去時(shí)。
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