at, on, in(A) at表示“在某一时刻，某一时点”。如：I get up at 6:00 every day. 我每天6点起床。注：at daybreak在黎明；at noon在中午；at night在夜间；at Christmas在圣诞节期间；at the age of five在五岁时。(B) on表示“在具体某或某天的上、下午”。如：I heard a shot on (the m
