题目内容：

I'm going to buy some envelopes at the n( )

优质解答

I'm going to buy some envelopes at the night.
有任何疑问也欢迎提问,

追问：

难道不是at night吗？要么也是in the night啊。

追答：

the night也行，只是指定哪个晚上罢了。 I'm going to buy some envelopes at night.我将在晚上去买一些信封。 I'm going to buy some envelopes at the night.我将在那天晚上去买一些信封。