问题
选择题
The climbers succeeded in climbing to the top of the mountains, and they owed their success to the preparations they ______.
A．make
B．had made
C．made
D．have made
答案
答案：B
题目分析：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。