______is often the case, one third of the workers have over-fulfilled the production plan.

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问题 ______is often the case, one third of the workers have over-fulfilled the production plan.

选项 A、What
B、This
C、That
D、As

答案D

解析 分析句子结构可知,逗号前面为非限制性定语从句,应用关系代词as引导,指代整个主句的内容,在从句中作主语,可位于句首、句中和句末。另外,也可将as is often the case视为固定搭配,意为“通常情况下,情况常常如此”。故选D。
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