电子版Cambridge English Objective Key/Objective First /Objective Advanced 4th edition /Objective PET 2nd

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资料内容：

Cambridge English Objective Key：SB with answers + audio, WB with answers, worksheets, SB cdrom， Presentation Plus

Objective First – 4th edition： Student’s book + audio, workbook + audio, Teacher’s Book + extras， Presentation Plus

Objective Advanced 4th edition : SB (with answers), WB, TB, SB audio, WB audio, CDrom:，Presentation Plus

Objective PET 2nd : SB, WB, TB, SB audio, tests. Classware