下列各句中，“之”的用法和意义与其他三项不同的是（ ）

We are just trying to reach a point ______both sides will sit down together and talk

Hey, John，let me have a look at your new bike, please. How much does it cost –I bought it _______ the price of $ 120.

______, I always feel I want a few more days.

当你认错人时，你应说：＂______________＂。