题目内容

________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               
             
试题分析：考查连词。句意：他们第一次参观科技博物馆时，对所看到的一切表现出很大的兴趣。The first time 第一次做某事的时候，是连词。For the first time第一次，做状语；at first 首先；D项是错误的用法。所以选A项。          
考点 : 考查连词
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