题目内容

—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
因为ever since是“自那以后(直到现在)”之意，常与完成时连用，又根据but 可知，现在也还在设法与他们取得联系，所以用现在完成进行时。
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