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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

试题分析:考查时态题。句意:—你们昨天在山区里找到那对失踪的夫妻了吗?—没有。但是我们正在在努力和他们取得联系。根据句意说明自从过去的一个时间开始到现在,我们一直都在做的事情,那么使用现在完成进行时。故B正确。
点评:时态题的考查关键是抓住句子的上下文含义和句中的时间状语。要根据时间状语来选择合适的时态,在平时的学习中要注意积累有关时态的用法和各种时态的特殊之处。如since, so far等经常与现在完成时连用。现在完成进行时表示从过去开始的动作到现在以来一直都在发生。
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