______ lack of sleep has led to a sharp increase in ______ number of mistakes in his job．


  1. A.
    the ， the
  2. B.
    a ， the
  3. C.
    a ， a
  4. D.
    ／ ， the
D
這句句子的意思是“缺乏睡眠導(dǎo)致了他工作中所犯錯(cuò)誤的增加�！眑ack of表示“缺乏”，是抽象概念名詞，所以我們用零冠詞，而后面的the number of mistakes 特指他工作中犯下的錯(cuò)誤，所以用定冠詞the．
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