Once again Dick failed in the exam． He _______ since he was quite a good student．

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• 1My classmate Jack ________ without saying good bye to them, for he is a polite boy．

  A.mustn't have left

  B.may not have left

  C.shouldn't have left

  D.can't have left

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• 2________, I would have told you．

  A.If I knew it

  B.Had I known it

  C.If I know it

  D.Did I know it

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• 3I requested ______ talking．Which of the following is right？

  A.that she stopped

  B.her stop

  C.that she should stop

  D.that she stops

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• 4________ I known it, I should have told him.

  A.Have

  B.Had

  C.Having

  D.If

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• 5I wish your parents ______ you tomorrow．

  A.will forgive

  B.would forgive

  C.forgive

  D.have forgiven

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• 6Without electronic computers, much of today's advanced technology ________．

  A.will not have been achieved

  B.have not been achieved

  C.would not have been achieved

  D.had not been achieved

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