Let's make it at 6 o'clock 的表达是正确的吗?

Let's make it at 6 o'clock 的表达是正确的吗? let's make it at 3 o'clock on saturday afternoon ,为什么要用介词it? Let's make -----five o'clock A it at B it let ^s make it at 5 o^clock in the afternoon.这句话对吗 let's ____ it at 4 o'clock A make B help 选哪一个,为什么 Let's make __8 o'clock to meet at the gate of Linyi Zoo.A.it It's twelve o'clock.Let's It'stwelve o'clock.let's have( ) Let‘s make it ( )nine o'clock (　）the morning of this Sunday. Let's make it round about eight o'clock什么意思 英语 —What time shall we meet?let's make it ____nine o'clock.A 英语同义句转换it's twelve o'clock,let's have lunch.的同义句it's ___ ___