Scientists have( )many new methods of increasing the world.s food supply. A. put up with B. caught up with C. brought up with D. come up with
出自:乐山师范学院基础英语

完成拼图验证

按住下方滑块,将拼图拖到缺口处后松开。

拼图背景,将小拼图拖到缺口处
向右拖动滑块