单选

The basic features of __________the communication process are identified in one question: Who says through what channel to whom?

  • A.how
  • B.when
  • C.what
  • D.such
参考答案
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So many directors__________ , the board meeting had to be put off

  • A.were absent
  • B.been absent
  • C.had been absent
  • D.being absent
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