Question

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

A. Which B. When

C. What D. As

Answer 1

【答案】D

【解析】

试题分析：引导非限制性定语从句且位于主句之前，用as引导。句意：总是这样，我们已经制定出了生产计划。