—Did you find the missing couple in the mountain yesterday?
—No, but we ________ to get in touch with them ever since.
A．have triedB．have been tryingC．had triedD．had been trying
B
因?yàn)閑ver 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(shè)法與他們?nèi)〉寐?lián)系，所以用現(xiàn)在完成進(jìn)行時。
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