______is to arrange them in groups or sequences according to a plan.

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问题 ______is to arrange them in groups or sequences according to a plan.

选项 A、Things classified
B、In classifying things
C、As classification of things
D、To classify things

答案D

解析 本题考查非谓语动词做主语的用法。分析句子结构可知,只有动词不定式To classify things可以做主语,故为正确答案。句意为:将事物分类就是根据一定的计划把他们分组或排序。
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