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Before the drug is used on human beings, experts have to ______ dogs.A、be experi
Before the drug is used on human beings, experts have to ______ dogs.A、be experi
游客
2025-03-14
54
管理
问题
Before the drug is used on human beings, experts have to ______ dogs.
选项
A、be experimented
B、experiment
C、experiment with
D、experiment on
答案
D
解析
experiment on“对……进行实验”；experiment为不及物动词。
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