Polar bears liveon sea ice which they use as a platform for hunting sealsA. mostB. almostC

问题补充：

Polar bears liveon sea ice，which they use as a platform for hunting seals

A. most

B. almost

C. nearly

D. mostly

答案：

A. most

B. almost

C. nearly

(答案→)D. mostly

解析：mostly意为大部分的时候，相当于in most cases。