what's the number of the smith flight leaving beijing?为什么用ing形式

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what's the number of the smith flight leaving beijing?为什么用ing形式
what's the number of the smith flight leaving beijing?为什么用ing形式

what's the number of the smith flight leaving beijing?为什么用ing形式
what's the number of the smith flight which leaves Beijing?上面句子是定语从句的省略形式