这题如何填?
Jack could climb the tree when he was five.
Jack____ ____ ____ climb the tree____ ____ ____ ____ five.
参考答案:Jack was able to climb the tree at the age of five.
Jack could climb the tree when he was five.
Jack____ ____ ____ climb the tree____ ____ ____ ____ five.
参考答案:Jack was able to climb the tree at the age of five.