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—Whose computer doesn't work?

        — ____ ，I think．

       A．John has    B．John does     C．John   D．John's

—Whose computer doesn't work?

        — ____ ，I think．

       A．John has    B．John does     C．John   D．John's

—Whose computer doesn't work?

— ____，I think．

A．John has           B．John does         C．John              D．John's

—Whose computer doesn't work?

— ____ ，I think．

　 A．John has　 　　 B．John does　　 　 C．John　 　　　　 D．John's