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题型：句子翻译 题类： 难易度：普通
牛津译林版（2019）选择性必修第二册Unit 2 Sports culture同步练习卷
他开始失去信心了，因为每种方法都已经试过了。
— Actually. But the scientists say that before a new drug ___ on humans, plenty of studies ______.
{#blank#}1{#/blank#} had they got to the airport {#blank#}2{#/blank#} the plane took off.
The scientist {#blank#}1{#/blank#} 5G at least 3 times in his latest speech on AI.
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