David was always ______ his best in any danger, but at that moment he froze.
A．a(chǎn)tB．inC．forD．on
A

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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