He started swimming when he was four years old .(同义句) He sta

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He started swimming when he was four years old .(同义句) He started swimming（）（）

He started swimming（at age）（ four）.
或
He started swimming（at the age of four ）.
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再问：一个括号中一个词
再答：要是这样，只能是：He started swimming（at ）（ four）. 不过常见的是上面的两种。

He started swimming when he was four years old .(同义句) He sta He started swimming when he was four years old.(改为同义句） he started swimming when he was four years old,同义句 he started swimming when he was four years old 等于 he started tom started swimming when he was five years old改为同义句 he started swim when he was four years old Moart started writing music when he was four years old Mozart started writing music when he was four years old . Mozart started writing music when he was four years old. He began to learn English when he was four years old(同义句) He 同义句转换;He could speak English when he was four years old He _ Billy started painting when he was four years old.When he wa