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　　● 题目：

　　His approach to the problems that had worried writers throughout the late seventeenth and early eighteenth centuries was intensely practical.(剑5, Test 1 passage 1)

　　● 分析：

　　本句的主句为“His approach to the problems was intensely practical”;“that had worried writers throughout the late seventeenth and early eighteenth centuries”为定语从句，做the problems的定语，关系词为that。