2. 职称英语
  3. 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  28
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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