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
Clinical trials provide the only hope______.

选项

答案F

解析 第二段第三句说到,有些人对于常规的治疗方法已无可选择,所以参加临床试验,当然就是他们的唯一希望了。
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