Experiments of this kind ________in both the U．S and Europe well before the Second World War．

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• 1---- Mr. Smith is said to have retired and he is living in the country now.  ---- Yes. He ________ in our factory for 35 years! What a good worker!

  A.had been working

  B.had worked

  C.worked

  D.have worked

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• 2Mary said they __________with each other for six years before they got married.

  A.has fallen in love

  B.had fallen in love

  C.had been in love

  D.has been in love

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• 3As you can see，the number of cars on our roads________rising these days.

  A.was keeping

  B.keep

  C.keeps

  D.were keeping

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• 4—What do you think of his speech at the court? —Er..., sorry, I ________ about something else.

  A.had thought

  B.thought

  C.was thinking

  D.have been thinking

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• 5—Peter, where did you guys go for the summer vacation? —We ____ busy with our work for months, so we went to the beach to relax ourselves.

  A.had been

  B.have been

  C.were

  D.will be

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• 6The singer and dancer _______ asked to sing a song in public, and she agreed happily.

  A.is

  B.was

  C.are

  D.were

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• 7His novels sell best and have made him famous, but before that no one could have imagined how great a role he ______ in the literary world．

  A.had played

  B.has played

  C.is playing

  D.was to play

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• 8- How could I thank you enough? - Don't mention it. Any other man_______that.

  A.would do

  B.will do

  C.would have done

  D.must have done

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• 9It's great that all the visitors who _______ on the island were saved.

  A.trapped

  B.have been trapped

  C.had trapped

  D.had been trapped

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• 10I _______ up here night after night for weeks now. You see, I _______ to give you a surprise.

  A.have come; hoped

  B.have been coming; has hoped

  C.have come; was hoping

  D.have been coming; was hoping

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