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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】

試題分析：句意：David總是能從容面對任何危險, 但在此刻他卻愣住了。固定搭配be at one’s best處在最佳狀態(tài)，由句意可知選A。

考點: 考查固定搭配的用法。

 

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