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The climbers succeeded in climbing to the top of the mountains, and they owed their success to the preparations they ______.
A.makeB.had madeC.madeD.have made
B

试题分析:句意:登山者们最终设法登上了山顶,他们把这归功于先前他们所做的准 备。根据 succeeded和 owed 可知做准备是过去的过去的动作,此处应用过去完成时表示“过去的过去” 。所以选B。
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