Lesson eleven 主句是 a searcher needs to maximize research time。 whether.Or引起一个让步状语从句 while引起一个让步状语从句。by引起的介词 短语做状语,修饰谓语动词 needs o finding sites that contain information that is highly relevant to their specific needs动名词短语做b 的宾语,内含两个由that引起的定语从句。第 个定语从句修饰 sites,第二个修饰 information。Lesson Eleven 主句是a searcher needs to maximize research time。whether…or引起一个让步状语从句。 while引起一个让步状语从句。by引起的介词 短语做状语，修饰谓语动词needs。finding sites that contain information that is highly relevant to their specific needs动名词短语做by 的宾语，内含两个由that引起的定语从句。第 一个定语从句修饰 sites ， 第二个修饰 information