A man escaped from the prison last night. It was a long time ____________ the guards discovered what had happed.
出自:兰州大学大学英语(4)课程作业

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