【题目】 I ______ to reach the manager for the last two hours but the line is always busy.
A. tried B. have tried C. had tried D. have been trying
在线课程【答案】D
【解析】
试题分析：句意：在过去的两个小时我一直在努力和经理联系上，但一直占线。have been trying是现在完成进行时，强调动作一直在进行。故选D。
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