who are books made of中 哪个错了?

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whoarebooksmadeof中哪个错了?whoarebooksmadeof中哪个错了?whoarebooksmadeof中哪个错了?who错了改为whatbemadeof词组,意思是由……做成句

who are books made of中 哪个错了?
who are books made of中 哪个错了?

who are books made of中 哪个错了?
who 错了 改为 what
be made of 词组,意思是由……做成
句子 The books are made of paper.若要提问书是由什么做成的,可以用 What are the books made of

who改what