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
A
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科目：高中英語 來源：山西省月考題 題型：單選題

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

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