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

試題分析：句意：登山者們最終設(shè)法登上了山頂，他們把這歸功于先前他們所做的準(zhǔn) 備。根據(jù) succeeded和 owed 可知做準(zhǔn)備是過(guò)去的過(guò)去的動(dòng)作，此處應(yīng)用過(guò)去完成時(shí)表示“過(guò)去的過(guò)去” 。所以選B。
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