题目内容
（请给出正确答案）
Before the drug is used on human beings, experts have to ______ dogs.
A．be experimented
B．experiment
C．experiment with
D．experiment on
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更多“Before the drug is used on hum…”相关的问题
According to the author, forbidding people to take drugs is ______.
A．unacceptable to the majority of people
B．not an effective way to stop drug addiction
C．in the interest of the people and the governors
D．in agreement with the basic rights of citizens
He finished ______(type) his essay one day before the deadline.
Please___ the lights before you leave the room.
A.turn up
B.turn down
C.turn off
D.turn on
A.before
B.behind
C.against
D.after
