Mary____ ____ (work) in the factory since she left schoolthree years ago

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Mary________(work)inthefactorysincesheleftschoolthreeyearsagoMary________(work)inthefactorysinceshel

Mary____ ____ (work) in the factory since she left schoolthree years ago
Mary____ ____ (work) in the factory since she left schoolthree years ago

Mary____ ____ (work) in the factory since she left schoolthree years ago
has worked since she left schoolthree years ago是现在完成时时间状语

had worken

has worked

has worked