Lucy was interested in collectting shells when she was five.Lucy__ an__in collecting shells _ _ _
问题描述：
Lucy was interested in collectting shells when she was five.Lucy__ an__in collecting shells _ _ _
(同义句转换）
答
Lucy was interested in collectting shells when she was five.
= Lucy【took 】 an【interest 】in collecting shells 【at the age of five 】.