—were electric slippers invented? —Sorry. I don't know. [ ]A. Who B. Whom C. Of whom D. By whom

题目简介

—were electric slippers invented? —Sorry. I don't know. [ ]A. Who B. Whom C. Of whom D. By whom

题目详情

          were electric slippers invented?  
—Sorry. I don't know.    
[     ]
A. Who                      
B. Whom    
C. Of whom                  
D. By whom
题型:单选题难度:中档来源:同步题

答案

D

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