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　　● 题目：

　　He was also helped by six assistants, two of whom died whilst the dictionary was still in preparation.(剑5, Test 1 passage 1)

　　● 分析：

　　本句主句为“He was also helped by six assistants”;“two of whom died whilst the dictionary was still in preparation”为定语从句，做six assistants的定语，关系词为whom;在定语从句中，“whilst the dictionary was still in preparation”为whilst引导的时间状语从句。