As research techniques become more advanced, the number of animals ______ (use)

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问题 As research techniques become more advanced, the number of animals ______ (use) in experiments may decrease.

选项

答案 used

解析非谓语动词。分词或分词短语作定语时，如果被修饰的中心词与分词的关系是主动关系，用现在分词；如果被修饰的中心词与分词的关系是被动关系，则用过去分词。

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