China is no longer what it ___________.A. used to be B. was used to beingC.used to beingD. was used to be
出自:国家开放大学开放英语

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