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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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require是约束力强的动词
require sb to do sth
require that sb should do sth. should情态动词可以省略，谓语原型相当于不定式！！！！！
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