答案：D

考查定语从句和强调句型。_______we arrived at the village.是定语从句，先行词是3 o’clock，在定语从句中作时间状语，所以用when引导；it was also at 3 o’clock______we arrived at the village是it was…that的强调句型，去掉it was和______后，剩下句子是we arrived at the village also at 3 o’clock，是一个完整的句子，所以是强调句型，要用that引导。所以选D。