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【題目】About ____ of the earth ____covered with water, but we have less and less available fresh water..

A. three-fourth, is B. three-fourths, is

C. three-fourth, are D. three-fourths, are

【答案】B

【解析】

試題分析：句意為：地球大約四分之三被水覆蓋。但是我們擁有的可用淡水越來越少。分數的表達：分子用基數詞，分母用序數詞，當分子大于一時，分母應加“s”。根據語境，這里主語為單數概念，根據主謂一致原則，謂語動詞也應用第三人稱單數。故應選B。

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