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Nowadays many women are _____ their late twenties or early thirties when they have their first child.

A.ofB.inC.onD.over

B

解析试题分析:句意:现在,很多女性都是在她们20多岁末期或者30岁初期时,生育她们的第一个孩子。In one’s twenties是固定用法,意思是在某人20多岁时,选B。
考点:考查固定用法

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