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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