___ they visited our school, they showed great interest in everything they saw.
A．The first timeB．For the first time
C．At firstD．At the first time
A

試題分析：考查名詞短語做連詞，the first time+從句，第一次…,句意：他們第一次到我們學校，他們對看見的一切都感興趣，F(xiàn)or the first time是介詞短語，不能接從句，at first介詞短語，首先，不能接從句，選A。
點評;英語中有的名詞詞組可以做連詞用，如every time，each time，by the time，the first time等，平時要多記。做題時靈活運用。
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