—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:

因為ever since是“自那以后(直到現(xiàn)在)”之意,常與完成時連用,又根據(jù)but 可知,現(xiàn)在也還在設法與他們?nèi)〉寐?lián)系,所以用現(xiàn)在完成進行時。

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