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　　>>>拓展阅读：手把手教你六步搞定雅思阅读长难句分析

　　● 题目：

　　The object could not be designed so that it was locked into the mould and therefore difficult to extract. (剑5, Test 2 passage 1)

　　● 分析：

　　本句的主句为“The object could not be designed”; “so that it was locked into the mould and therefore difficult to extract.”为so that引导的结果状语从句。