问题
选择题
Though trying really hard, they acknowledged ____ at last.
A．defeated
B．defeating
C．having defeated
D．having been defeated
答案
答案：D
考查acknowledge用法。承认做某事acknowledge doing sth. acknowledged having done表示动作已经发生
句意为，尽管很努力地尝试了，他们还是最终成人被打败了。