After he failed in the examination, he was on his best___ for a few months in class.
A. act B. behaviorism C. behavior D. action
出自:湖南大学-大学英语(高升专)

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