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    精英家教网 > 高中英语 > 题目详情
    ________ is often the case, we have worked out the production plan.
    A．WhichB．WhenC．WhatD．As
    D
    本题考从句。句中逗号后已构成句子，逗号前则不能是独立句子，只能是一个从句，句子不缺主、宾、表等成分，不需要名词性从句，排除what，从句中缺主语，when只是连词（或副词），不能充当主语，故排除。which和as都能引导定语从句，先行词都可以是一句话（或一个短语或从句），但which引导的定语从句不能放在句子开头，故选D，排除A。
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