Question

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

A．of

B．in

C．on

D．over

Answer 1

B

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。