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

______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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