“( )were electric slippers invented 请选择 A WHO B WHOM C OF WHOM D BY WHOM

问题描述:

“( )were electric slippers invented 请选择 A WHO B WHOM C OF WHOM D BY WHOM

D为什么电动拖鞋是谁发明的? 谁和发明之间得要一个介词by,表示被谁发明