these trials, people are ________assigned to a "treatment" group, which benefits from the project, and a "control" group, which does not.
| A．initially | B．conventionally |
| C．superbly | D．randomly |
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these trials, people are ________assigned to a "treatment" group, which benefits from the project, and a "control" group, which does not.
| A．initially | B．conventionally |
| C．superbly | D．randomly |
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