This is () the most difficult job I have ever tackled.
Aby rights
Bby itself
Cby oneself
Dby far
出自:湖北师范大学大学英语

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