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　　● 题目：

　　James Boswell, his biographer, described the garret where Johnson worked as ‘fitted up like a counting house' with a long desk running down the middle at which the copying clerks would work standing up.(剑5, Test 1 passage 1)

　　● 分析：

　　本句主句为“James Boswell described the garret as ‘fitted up like a counting house' with a long desk.”;“his biographer”为James Boswell的同位语;“where Johnson worked”为定语从句，做the garret的定语，关系词为where; “running down the middle”为现在分词短语做定语，做a long desk的定语;“at which the copying clerks would work standing up”为定语从句，做long desk的定语，关系词为which。