David was always ______ his best in any danger, but at that moment he froze.A．at_刷题宝

题干

David was always ______ his best in any danger, but at that moment he froze.

A．at

B．in

C．for

D．on

上一题下一题 0.85难度单项选择更新时间:2014-04-22 07:47:15

答案(点此获取答案解析）

小学学科试题库

初中学科试题库

高中学科试题库