31. That claim has been and much debated, but it seems to hold up.
D
A. refused B.denied C.conceded
challenged
出自:长江大学大学英语(二)

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