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精英家教網 > 高中英語 > 題目詳情
2．_____is often the case，we have worked out the production plan．（　　）
A．ItB．WhichC．WhatD．As

分析 正如通常情況，我們研究出了生產計劃．

解答 答案D．分析句子結構可知，逗號之前是非限制性定語從句，逗號之后是主句，從句中關系代詞"as"作主語，意為"正如"，固定短語"as is often the case"，通常情況如此．

點評 本題考查非限制性定語從句．解答此類題目首先要分析句子結構，非限制性定語從句中逗號是一個明顯的標志，然后分析非限制性定語從句中的成分，如果缺成分用關系代詞，如果不缺成分用關系副詞．

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