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Present Perfect
6 Present Perfect: Since and For Bill Gates and Microsoft Focus on Grammar 3 Part IV, Unit 16 By Ruth Luman, Gabriele Steiner, and BJ Wells Copyright © 2006. Pearson Education, Inc. All rights reserved.
6 Present Perfect: Since and For Bill Gates and Microsoft Focus on Grammar 3 Part IV, Unit 16 By Ruth Luman, Gabriele Steiner, and BJ Wells Copyright © 2006. Pearson Education, Inc. All rights reserved.