◎ 题干
The doctor tried to find out ______ that had caused the spread of the terrible disease.        

A. what it was                        
B. why it was    
C. whatever was                      
D. however was
◎ 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“The doctor tried to find out ______ that had caused the spread of the terrible disease.[ ]A. what it was B. why it wasC. whatever was D. however was…”主要考查了你对  【宾语从句】【强调句】  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。