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---Is ________book on the desk __________useful one?

---No, it isn’t.

A．the; an        B．the; a         C．a(chǎn); the        D．the;/

一Is ______ book on the desk ______ useful one?

一No, it isn’t．

A．the；an        B．the；a           C．a(chǎn)；the        D．the；the