They showed great interest in everything they sawthey visited the farmA. for the first ti

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A. for the first time
B. at the first time
C. at first
(答案→)D. the first time
解析：句意：他们第一次到农场的时候，他们对他们看到的一切很感兴趣。此处ABC是介词短语，the first time是名词用作连词，引导状语从句。故选D。