He tried his best to finish the work,_______difficult it was.
A、however
B、no matter
C、whatever
出自:安徽财经大学—会计学

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