试题 试卷
题型：语法填空（单句） 题类：常考题 难易度：普通
福建省福州市八县（市、区）一中2019-2020学年高一上学期英语期末联考试卷（含小段音频）
— Actually. But the scientists say that before a new drug ___ on humans, plenty of studies ______.
—Yes, the posts about the virtual green frog over 4 million times.
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