【題目】 of the students in the classroom. They are doing homework.

A. two three; is B. two thirds; are

C. two third; are D. second third; is

【答案】B

【解析】

試題分析：句意：2/3的學(xué)生都在教室里，他們正在做作業(yè)。分?jǐn)?shù)的表達(dá)方式是，先寫(xiě)分子后寫(xiě)分母，分子用基數(shù)詞，分母用序數(shù)詞，分子大于分母加s；當(dāng)分?jǐn)?shù)加of加名詞做主語(yǔ)時(shí)，謂語(yǔ)動(dòng)詞的單復(fù)數(shù)根據(jù)名詞的單復(fù)數(shù)來(lái)決定。故選B。

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