将下列句子改为被动语态:who designed the CD-ROM _____ whom _____ the CD-ROM?少打一条横线_____ whom _____ the CD-ROM _____?

问题描述:

将下列句子改为被动语态:who designed the CD-ROM
_____ whom _____ the CD-ROM?
少打一条横线
_____ whom _____ the CD-ROM _____?

答案与一楼一样
空格一次是BY was designed

By whom was the CD-ROM desighed?