______of the earth is covered by water.

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问题 ______of the earth is covered by water.

选项 A、Three-fourth
B、Three-fourths
C、Three-four

答案B

解析本题考查分数。分数由基数词和序数词合成，分母用序数词，分子大于1时，分母的序数词用复数形式。所以答案为B。

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