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As research techniques become more advanced, the number of animals ______ (use)
As research techniques become more advanced, the number of animals ______ (use)
游客
2023-09-28
43
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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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