◎ 题干
_____ is often the case, we have worked out the production plan.
[     ]
A. Which  
B. When
C. What    
D. As
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“_____ is often the case, we have worked out the production plan.[ ]A. Which B. WhenC. WhatD. As …”主要考查了你对  【关系代词】【非限制性定语从句】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。