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1.Who designed the CD_ROMs.(改为被动语态)

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1.Who designed the CD_ROMs.(改为被动语态)
——whom ______the cd-roms_____?
Whom were the CD-ROMs designed by?
楼上欠了个最重要的词:by
做这类题的方法是,把需要作为被动语态的词按陈述句语序列在句首,再一一加入其他部分,就像上文的句子,先改为:
The CD-ROMs were designed by whom?
然后再将疑问词whom提前,把陈述句The CD-ROMs were designed by改为一般疑问句形式,就变成了:Whom were the CD-ROMs designed by?