The federal rules aimed at protecting human subjects of medical experiments were established to ensure that patients must be warned of potential risks and an independent panel would evaluate the experiment before it was conducted.
must be warned of potential risks and an independent panel would
must be warned of potential risks and that an independent panel
are warned about potential risks and that an independent panel
will be warned about potential risks and an independent panel would
would be warned of potential risks and that an independent panel would
ensure和must语义重复
在过去的时态描述将要发生的事情要用would
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