did you find the missing couple in the mountain yesterday?--no ,but we( )to getin touch withthem ever since.A.have tried b.have been trying 为什么选B B的时态是什么?A不对么?

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didyoufindthemissingcoupleinthemountainyesterday?--no,butwe()togetintouchwiththemeversince.A.havetri

did you find the missing couple in the mountain yesterday?--no ,but we( )to getin touch withthem ever since.A.have tried b.have been trying 为什么选B B的时态是什么?A不对么?
did you find the missing couple in the mountain yesterday?--no ,but we( )to get
in touch withthem ever since.
A.have tried b.have been trying 为什么选B B的时态是什么?A不对么?

did you find the missing couple in the mountain yesterday?--no ,but we( )to getin touch withthem ever since.A.have tried b.have been trying 为什么选B B的时态是什么?A不对么?
现在完成进行时 have been doing.
因为搜救工作持续到说话的时间点仍然在继续,但是搜救无果.

一种持续状态...不多解释...