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题库 / Prep2007E1-SC-141
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
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ensure确保，ensure that sb do sth，ensure已经表示命令语气了，后面不再跟情态动词表命令语气。
ensure sth，The book ensured his success.；ensure (that)+宾语从句，Ensure the guard is in place.
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