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题库 / Prep2007E2-SC-134
If a drug that is already on the market has the potential to help adults and children who have the same disease, or if it is widely used in children and the absence of labeling seems dangerous, the FDA can require that the drug undergo pediatric study.
that the drug undergo
that the drug undergoes
that the drug is to undergo
the drug undergoing
the drug to have to undergo
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命令语气的动词：
要么是 V that do sth, 只能用动词原型+不能再有情态动词等表命令语气的动词，要么是V sb to do sth
除forbid用to do外，其他表禁止的命令语气的动词一律用 v from doing sth
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