--What’s this?
--It’s__ backpack.
--Where’s__ backpack?
--It’s on the bed.
| A．a; a | B．the; / | C．the; the | D．a; the |
--What’s this?
--It’s__ backpack.
--Where’s__ backpack?
--It’s on the bed.
| A．a; a | B．the; / | C．the; the | D．a; the |
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