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有时定语从句中还有其他成分，介词则位于定语从句之中。如：
This is the engineer who he cooperated with in the project.
先行词指人时，关系代词既可以用who, 也可以用that。但关系代词在定语从句中用作主语时，多用主格who。如：
Beyond the practical need to make order out of chaos, the rise of the dictionaries is associated with the rise of the English middle class, who were anxious to define and circumscribe the various world to conquer.（persons, those, people等先行词多用关系代词who）
It is Tom who should be punished.（在强调结构中，指人时多用who）
The American zoologist Donald Griffin, who was largely responsible for the discovery of sonar in bats, coined the term ‘echolocation’ to cover both sonar and radar, whether used by animals or by human instruments.
朗阁雅思培训中心分析认为，在下列情况中多用that, 而不用who或者which。如：
★ much （很多）
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