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 that sb do sth,含命令语气的动词,后面一定用动词原型,同理还有demand, dictate(命令), insist, mandate(命令,授权), propose, recommend, request(要求), stipulate(规定), suggest(建议)
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