The Greens have stayed in China for three years.（改同义句）
问题描述：
The Greens have stayed in China for three years.（改同义句）
1.The Greens （_____) (_____) China three years ago.
2.(______) (______) three years (______) the Greens came to China.
3.Three years (______) (______) since the Greens came to China.
答
has been
it wassince
has gone