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?
1.Who designed the CD_ROMs.(改为被动语态）
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