ChaseDream

标题: 请教prep的一道sc [打印本页]

作者: tedpgsps 时间: 2008-4-15 16:17
标题: 请教prep的一道sc

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.

(A) that the drug undergo

(B) that the drug undergoes

(D) the drug undergoing

(E) the drug to have to undergo

这道题问什么要选A呢，B和D都有什么问题呢？

作者: mych666666 时间: 2008-4-15 17:16
require that...从句，要用省略的虚拟语气，即require that...do sth.用动词原型undergo

作者: tedpgsps 时间: 2008-4-15 19:18
谢啦！

欢迎光临 ChaseDream (https://forum.chasedream.com/)