it 指約定
這里指約定在,時(shí)候
問題補(bǔ)充：
sorry,字打錯(cuò)了,應(yīng)該改為：為什么要用介詞at,另一本書上說不應(yīng)該用那個(gè)介詞,所以希望各位幫忙解決.
其實(shí),用at還常見些,at可要可不要,因?yàn)?make 既可接名詞,又可接介詞短語做賓補(bǔ),見例句：
We can make it at 8∶ 00.
我們可以定在8∶00.
Do you think you can make it at...
你看能不能定在……呢?
I'm afraid I can't make it at 5 o'clock.
明天下午5：00我恐怕不行.
.I'm afraid he can't make it at 4:00.Would you make it another time?
恐怕4點(diǎn)他不行,你能改個(gè)時(shí)間嗎?
That's o.k.then let's make it three o'clock at my office.
很好.那咱們約定3點(diǎn)在我辦公室見.