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The teachers are busy _______ the exam papers while the students are busy ________ the exam.


  1. A.
    prepare; prepare for
  2. B.
    preparing; preparing for
  3. C.
    prepare for; prepare
  4. D.
    preparing for; preparing
B
be busy doing sth.“忙于干某事”,prepare the exam papers“准备试卷”;prepare for the exam“为考试而做准备”。
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