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—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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