【題目】 ____is often the case, we have worked out the production plan.

A. Which B. When

C. What D. As

【答案】D

【解析】

試題分析：引導非限制性定語從句且位于主句之前，用as引導。句意：總是這樣，我們已經(jīng)制定出了生產(chǎn)計劃。

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