—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

B


解析:

從昨天到現(xiàn)在我們一直在努力與他們聯(lián)系，表示過去的動作一直延續(xù)到現(xiàn)在還在進(jìn)行，用現(xiàn)在完成進(jìn)行時。故選B

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