2. 外语
  3. Before the drug is used on human beings, experts have to______dogs.

Before the drug is used on human beings, experts have to______dogs.

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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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