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thehistorianattemptingtoreconstructthedistantpastisalwaysfacedwithadifficulttask.alorrydriverwhowasdrawingupalongsidehiscar,pulledupallofasudden.请问这2句为什么前一句没有加whois而后面那句话有加呢?

题目详情
the historian attempting to reconstruct the distant past is always faced with a difficult task.
a lorry driver who was drawing up alongside his car,pulled up all of a sudden.
请问这2句为什么前一句没有加who is 而后面那句话有加呢?请问他们的区别在哪?
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答案和解析
who is 有人的成分在里面,是宾语从句,WHO就是指A LORRY DRIVER 一个货车司机,这两句的句型是不一样的.