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)

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 )