As a leading producer of greenhouse gases, China _________the United States as the largest consumers of energy．

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• 1--- Hey, Mary, your backpack looks nice. When did you buy it. --- I ____ it for two weeks.

  A.had

  B.bought

  C.have had

  D.have bought

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• 2—Has Nancy gone back to her home in the UK? —Yes. She ______ here only for three days with her friend.

  A.stayed

  B.had stayed

  C.has stayed

  D.is staying

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• 3My sister _____ Tony for ten years next year.

  A.has been married to

  B.had been married with

  C.will have been married to

  D.will have been married with

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• 4Drivers must stop when the traffic lights _____ red．

  A.turn

  B.will turn

  C.turned

  D.were turning

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• 5At this time tomorrow ________over the Atlantic.

  A.we're going to fly

  B.we'll be flying

  C.we'll fly

  D.we're to fly

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• 6The fire was finally brought under control, but extensive damage _________.

  A.is caused

  B.was causing

  C.had caused

  D.had been caused

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• 7---Peter, where did you guys go for the summer vacation? ---We _______ busy with our work for months, so we went to the beach.

  A.were

  B.had been

  C.have been

  D.will be

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• 8—Guess what! We'll have a chance to visit our sister school in Denmark this summer! —How nice! You ________ a different culture then.

  A.will have experienced

  B.have experienced

  C.have been experiencing

  D.will be experiencing

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• 9—Why weren't you at the meeting? —I________ for a long distance call from my sister in Americ

  A.A.was waited

  B.was waiting

  C.has waited

  D.have been waiting

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• 10If our marketing plan succeeds, we _______ the sales by thirty percent next year.

  A.would increase

  B.will increase

  C.would have increased

  D.will be increasing

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