It was three o’clock ________ we arrived at the mountain village．
A.thatB.sinceC.untilD.before在线课程D
如果选择A项看成强调句的话，three前面须加介词at。而since前面常是表示时间段的名词。until前面常是表延续的动词。故选择D项。句意为：我们到达小山村时已经三点了。