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。