—Did you find the missing couple in the mountain yesterday?
—No, but we to get in touch with them ever since.
A. have tried
B. have been trying
C. had tried
D. had been trying
网友回答
A. have tried
(答案→)B. have been trying
C. had tried
D. had been trying
解析：从昨天到现在我们一直在努力与他们联系，表示过去的动作一直延续到现在还在进行，用现在完成进行时。故选B