He is so determined!He ________ on the problem for two hours, and he will go on with it until he works it out．

试卷相关题目

• 1By the time we get to their house, they ________ supper．

  A.would finish

  B.have finished

  C.will have finished

  D.are having

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• 2I suddenly ________ with him last October and we ________ ever since．

  A.got in touch; have got in touch

  B.got in touch; have stayed in touch

  C.kept in touch; have kept in touch

  D.stayed in touch; have got in touch

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• 3After Smith ________ for half an hour, he came to the conclusion that Helen was not coming．

  A.has been waiting

  B.waited

  C.has waited

  D.had been waiting

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• 4The mayor of Beijing says that all construction work for the Beijing Olympics ________ by the end of this month．

  A.has been completed

  B.has completed

  C.will have completed

  D.will have been completed．

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• 5The moment Jenny got home, she noticed a woman waiting for her．She ________ her before．

  A.never saw

  B.had never seen

  C.never sees

  D.has never seen

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• 6What do you think the children ________ when we get home?

  A.are doing

  B.will do

  C.have been doing

  D.will be doing

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• 7Susan is on vacation in Florida, and she doesn't take much money with her．So, by the end of her vacation, she ________ all her money．

  A.has spent

  B.will be spending

  C.had spent

  D.will have spent

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• 8The officials concluded from a analysis of the traffic accident that ________ by human error．

  A.they were caused

  B.it was caused

  C.it had been caused

  D.they had caused

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• 9When you arrive, I ________ in reception for you．

  A.wait

  B.am waiting

  C.am going to wait

  D.will be waiting

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• 10The conference _________ a full week by the time it ends．

  A.must have lasted

  B.will have lasted

  C.would last

  D.has lasted

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