If we________your phone number, we could have contacted you earlier.A、knewB、had

游客2023-09-18 99

问题 If we________your phone number, we could have contacted you earlier.

选项 A、knew
B、had known
C、know
D、will know

答案 B

解析本题考查If引导的非真实条件句——虚拟语气的用法。当表述的内容与过去事实相反时，If从句用过去完成时，主句用would／could／should／might have done结构。根据句意和主句结构，确定从句应用过去完成时had known，故本题答案为B)。

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