Most of the people________were famous scientists from Americ

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• 1-Oh，it’s you！I________you.-I have changed my hairstyle，and I’m wearing dark glasses.

  A.don’t recognize

  B.hadn’t recognized

  C.didn’t recognize

  D.haven’t recognized

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• 2Oh，it’s you，my dear friend.I________you at first sight.Where have you been these years?

  A.didn’t recognize

  B.hadn’t recognized

  C.haven’t recognized

  D.don’t recognize

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• 3Miss Jones _______ music at Bardon School for five years when she was abroad and now she is an actress.

  A.taught

  B.has taught

  C.had taught

  D.has been teaching

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• 4Lang Ping , who used to be captain of Chinese Women's volleyball team, ______volleyball in China for almost twenty years.

  A.have played

  B.played

  C.was playing

  D.had played

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• 5All her time ___ experiments, she has no time for films.  

  A.devoted to do

  B.devoted to doing

  C.devoting to working

  D.is devoted to doing

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• 6The first decade of the 21st century ______ breathtaking, non-stop development in China ?

  A.witnesses

  B.witnessed

  C.will witness

  D.had witnessed

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