D? on, of介词in, on, at在表示时间时的用法区别①in时间范围大(一天以上)如:in Tanuary, in winter, in 1999;泛指在上午,下午,晚上,如:in the morning(afternoon, evening).习惯用法:in the daytime 在白天。②on指在某一天或某一天的上午,下午,晚上,如:on Monday, on Sunday afternoon, on July 1, 1999③at时间最短,一般表示点时间,如at six o’clock, at three thirty.习惯用法:at night, at noon, a... |