题干
我姑姑在5岁时开始弹钢琴。
My aunt began to play the piano____ ____ ____ ____ five.
答案(点此获取答案解析）
at,the,age,of
我姑姑在5岁时开始弹钢琴。
My aunt began to play the piano____ ____ ____ ____ five.
