[文法] 請教網路上看到的英文句子

[jerry185 (jerry)]

Ferrari have announced they will hold an online auction next week in aid of
"those affected by" the two earthquakes which rocked Northern Italy's Emilia
Romagna region in May.

這邊想請教英文先進，"those affected by"原始寫法會是"those whom affected by"嗎？

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→ jacqueswu:those which were affected by the two earthquakes~
→ linzh:          ^^^^^who
→ jerry185:這句應該是修飾人吧...所以應該還原成who