A candidates for clinical trials B during the trial C medical knowledge D in humans E before participation F for some patients

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问题 A candidates for clinical trials
B during the trial
C medical knowledge
D in humans
E before participation
F for some patients
New drugs or devices must be tested before being used______.

选项

答案D

解析短文第一句就说到，新药物或新仪器用于人体是否安全有效需要进行临床试验。

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