—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
—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
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。