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

游客2023-09-28 60

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。

转载请注明原文地址:http://tihaiku.com/zcyy/3053778.html

相关试题推荐

随机试题

最新回复(0)

______hisphonenumber,Iwouldhavemadeacalltohim.A、IfIknewB、IfIshoul