Ships traveling in the North Atlantic during the winter must be constantly watchful to avoid icebergs, large masses of ice _____

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问题 Ships traveling in the North Atlantic during the winter must be constantly watchful to avoid icebergs, large masses of ice ______ only one-ninth is visible above water.

选项 A、so that
B、in that
C、which
D、of which

答案D

解析 large masses of ice是iceberg的同位语,关系代词which的先行词是ice,相当于only one-ninth of the ice is visible above water,所以D是正确答案。so that引导目的状语从句,in that引导原因状语从句,均与句义不符。
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