They were eating lunch when you got out of the library(对划线部分提问)

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They were eating lunch when you got out of the library(对划线部分提问)
They were eating lunch when you got out of the library(对划线部分提问)

They were eating lunch when you got out of the library(对划线部分提问)
What were they doing when you got out of the library?(划线是:were eating )
When were they eating lunch?(划线是:when you got out of the library)
Who were eating lunch when you got out of the library (划线是:They )