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

问题描述:

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

He started swimming(at age)( four).

He started swimming(at the age of four ).
如果不明白,请再问;如果对你有所帮助,
请点击本页面中的“选为满意回答”按钮,一个括号中一个词要是这样,只能是:He started swimming(at )( four).不过常见的是上面的两种。