Look at your__.Are they old?1.book 2.books 3.the books选哪个3选1

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Look at your__.Are they old?1.book 2.books 3.the books选哪个3选1

Look at your__.Are they old?1.book 2.books 3.the books选哪个3选1
Look at your__.Are they old?1.book 2.books 3.the books选哪个
3选1

Look at your__.Are they old?1.book 2.books 3.the books选哪个3选1
2

2

books
用复数,因为后面是are