题目内容：

3.I could have called you yesterday,but I ________ your telephone number.
.
I could have called you yesterday,but I ________ your telephone number.
A.didn't have B.won't have C.hadn't had
D.wouldn't have
能解释一下为什么不选C,麻烦您了

优质解答

因为 could have done 的结构是本不应该做某事 但却做了.说明已经告诉了.动作发生在过去,所以用过去式、、、had had 是过去完成时.过去完成时必须是过去的过去.必须要有一个过去的时间段.
比如
when I got the station yesterday,the bus had left.这里用had left 是因为在我到达车站之前 车已经走了.这个走,是发生在我到达之前.got已经是过去式（因为是yesterday） 所以后面用had left.而你说的这题并不是过去的过去,它没有一个对比时间段