( )sunday night , I visited a good friend of mine

good night to you and your friend\u8fd9\u53e5\u8bdd\u5bf9\u90e8\u961f\u3002

\u5bf9

a good friend of mine \u7528\u6240\u6709\u683c\uff1b
They are my parents\uff0cmy sister and me. be \u52a8\u8bcd\u540e\u9762\u63a5\u5bbe\u8bed\u3002

a 是正确的
at, in, on在表示时间上的区别
1. at指时间表示:
(1)时间的一点、时刻等。如:
They came home at sunrise (at noon, at midnight, at ten o’clock, at daybreak, at dawn).
(2)较短暂的一段时间。可指某个节日或被认为是一年中标志大事的日子。如:
He went home at Christmas (at New Year, at the Spring Festival, at night).
2. in指时间表示:
(1)在某个较长的时间(如世纪、朝代、年、月、季节以及泛指的上午、下午或傍晚等)内。如:
in 2004, in March, in spring, in the morning, in the evening, etc
(2)在一段时间之后。一般情况下,用于将来时,谓语动词为瞬间动词,意为“在……以后”。如:
He will arrive in two hours.
谓语动词为延续性动词时,in意为“在……以内”。如:
These products will be produced in a month.
注意:after用于将来时间也指一段时间之后,但其后的时间是“一点”,而不是“一段”。如:
He will arrive after two o’clock.
3. on指时间表示:
(1)具体的时日和一个特定的时间,如某日、某节日、星期几等。如:
On Christmas Day(On May 4th), there will be a celebration.
(2)在某个特定的早晨、下午或晚上。如:
He arrived at 10 o’clock on the night of the 5th.
(3)准时,按时。如:
If the train should be on time, I should reach home before dark.

A.因为具体时间要用on:on+星期或日期+morning……

a

A.
on Sunday night.在周日晚上.

在某天的早\中\晚都要用on.

A,指出了具体在某天都要用on

(On) Sunday night , I visited a good friend of mine
口语里 On 也可以缺掉

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