________they visited the Science Museum，they showed great interest in everything they saw.
A．The first timeB．For the first timeC．At firstD．At the first time
A               
             
試題分析：考查連詞。句意：他們第一次參觀科技博物館時，對所看到的一切表現(xiàn)出很大的興趣。The first time 第一次做某事的時候，是連詞。For the first time第一次，做狀語；at first 首先；D項是錯誤的用法。所以選A項。          
考點 : 考查連詞
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