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.

admin2014-10-11  41
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。
转载请注明原文地址:https://kaotiyun.com/show/6pxO777K
0

成人本科学位英语

相关试题推荐
随机试题
最新回复(0)