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【題目】About_______of the students in our class were born in the____.

A．two-thirds, 1990s

B．two-thirds, 1990

C．two-third, 1990s

【答案】A

【解析】

試題解析：

分數的分子用基數詞，分母為序數詞。分子不是一的，分母序數詞加S。表示年代的要在后面加“s”。故選A

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