________ is often the case, we have worked out the production plan．


  1. A.
    Which
  2. B.
    When
  3. C.
    What
  4. D.
    As
D
解析：
本題考從句。句中逗號后已構(gòu)成句子，逗號前則不能是獨立句子，只能是一個從句，句子不缺主、賓、表等成分，不需要名詞性從句，排除what，從句中缺主語，when只是連詞（或副詞），不能充當主語，故排除。which和as都能引導定語從句，先行詞都可以是一句話（或一個短語或從句），但which引導的定語從句不能放在句子開頭，故選D，排除A。
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