8天堂资源在线,国产成人久久av免费高潮,国产精品亚洲综合色区韩国,国产欧美va天堂在线观看视频,xx色综合

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
相關(guān)習(xí)題

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

查看答案和解析>>


同步練習(xí)冊答案