Polar bears live mostly on_______sea ice,which they use as_______platform for hunting seals.
| A．a;a | B．a;the |
| C．不填;a | D．the;不填 |
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Polar bears live mostly on_______sea ice,which they use as_______platform for hunting seals.
| A．a;a | B．a;the |
| C．不填;a | D．the;不填 |
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