◎ 题干
It is uncertain       side effect the medicine will bring ?about?,although about two thousand
patients have taken it.
[     ]
A. that      
B. what
C. how     
D. whether
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“It is uncertain side effect the medicine will bring ?about?,although about two thousand patients have taken it. [ ]A. thatB. whatC. howD. whether …”主要考查了你对  【连接代词】【主语从句】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。