Even if you had not been able to see her, you us.
A. told
B. had told
C. should tell
D. should have told
网友回答
A. told
B. had told
C. should tell
(答案→)D. should have told
解析：考查虚拟语气的用法。由had not been able 可以看出条件状语从句是对过去的虚拟，主句没有自己的时间状语从语义上看也是对过去的虚拟，所以谓语动词应该是should have done句意：即使你见不着她，你也应该告诉我们一声。故选D； should也可用ought to，“should have done”表示本应该做某事却没做。