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(chǎn)計(jì)劃．

解答 答案D．分析句子結(jié)構(gòu)可知，逗號(hào)之前是非限制性定語(yǔ)從句，逗號(hào)之后是主句，從句中關(guān)系代詞"as"作主語(yǔ)，意為"正如"，固定短語(yǔ)"as is often the case"，通常情況如此．

點(diǎn)評(píng) 本題考查非限制性定語(yǔ)從句．解答此類(lèi)題目首先要分析句子結(jié)構(gòu)，非限制性定語(yǔ)從句中逗號(hào)是一個(gè)明顯的標(biāo)志，然后分析非限制性定語(yǔ)從句中的成分，如果缺成分用關(guān)系代詞，如果不缺成分用關(guān)系副詞．

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