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    The flu is believed________ by viruses that like to reproduce in the cells inside the human nose and throat．


    1. A.
      causing
    2. B.
      being caused
    3. C.
      to be caused
    4. D.
      to have caused

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    ________the old man got on the bus．


    1. A.
      Supporting the young man
    2. B.
      Supported by the young man
    3. C.
      Being supported by the young man
    4. D.
      To support the young man

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    ______the extremely hot weather, we continued having classes．


    1. A.
      Thanks to
    2. B.
      In addition to
    3. C.
      In defence of
    4. D.
      Regardless of

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    ________ such heavy pollution already, it may now be too late to clean up the river．


    1. A.
      Having suffered
    2. B.
      Suffering
    3. C.
      To suffer
    4. D.
      Suffered

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    Father went to his doctor for ________ about his heart trouble．


    1. A.
      an advice
    2. B.
      advice
    3. C.
      advices
    4. D.
      the advices

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