GRE Text Completion Question 2931
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Source: 1991
In the design of medical experiments, the need for （i）_____assignment of treatments to patients must be （ii）_____ the difficulty of persuading patients to participate in an experiment in which their treatment is decided by chance.
- A independent.. amended by
- B competent.. emphasized by
- C mechanical.. controlled by
- D swift. .associated with
- E random.. reconciled with