问题
选择题
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
答案
答案：C
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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
答案：C