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

A.atB.inC.forD.on

A

解析试题分析:句意:David总是能从容面对任何危险, 但在此刻他却愣住了。固定搭配be at one’s best处在最佳状态,由句意可知选A。
考点: 考查固定搭配的用法。

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