有一道SAT题 麻烦了
问题描述：
有一道SAT题 麻烦了
（ One important cause of the medication shortage is when ) healthy people, attempting to vuild up immunity, take medications that are intended to treat illnesses.
改为
A~ One important cause of the medication shortage is that
B~ Most medication shortages are the result of that
C~ Most medication shortages result from when
哪两个不对,麻烦解读一下为什么,谢谢各位高手相助了,有追加
答
B & C are incorrect.For B,"result of" must be followed by nouns,e.g.result of bad weatherFor C,"result from" must be followed by nouns,e.g.,result from bad weather