Do you know the difficulty he had ______ the work ( )
·ofinishing
·to finish
·ifinishing
·having finished
出自:佳木斯大学语言治疗学

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