题目内容

【题目】I started riding a bike when I was ten years old.
I started riding a bike ten.

【答案】at;the;age;of
【解析】句意:我10岁的时候开始骑自行车。when I was ten years old我10岁的时候;表达年龄的短语是:at the age of,在……岁时,所以答案是at the age of。

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