答案：A

题目分析：考查从句，从句we are given the opportunity to solve problems ourselves.不缺少成份，所以在关系副词里选择，所以选A

点评：从句是高中阶段的重点和难点，是高考常考内容，需要考生能够分析理解句子的结构，熟记连词关系词的句法功能。

即学即练：As a child, Jack studied in a village school，______ is named after his grandfather．

A which        B where        C what      D. That

选A