— Many drugs have been forbidden recently.— Actually. But the scientists say that before a new drug ___ on humans, plenty of studies ______.

题型：单选题题类：常考题难易度：普通

浙江省绍兴市第一中学2016届高三下册英语开学考试试卷

— Many drugs have been forbidden recently.

— Actually. But the scientists say that before a new drug ___ on humans, plenty of studies ______.

A、can be tested; are needed B、can test; are needed C、can be tested; need D、can test; need

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