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2._____is often the case,we have worked out the production plan.(  )
A.ItB.WhichC.WhatD.As

分析 正如通常情况,我们研究出了生产计划.

解答 答案D.分析句子结构可知,逗号之前是非限制性定语从句,逗号之后是主句,从句中关系代词"as"作主语,意为"正如",固定短语"as is often the case",通常情况如此.

点评 本题考查非限制性定语从句.解答此类题目首先要分析句子结构,非限制性定语从句中逗号是一个明显的标志,然后分析非限制性定语从句中的成分,如果缺成分用关系代词,如果不缺成分用关系副词.

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