下列各句中“之”的用法不同于其他三句的一项是（      ）

What’s the event like–Several witnesses’ _______differ from the official version.

下列各句中，加点词语使用恰当的一句是（ ）

Only_______ stand-up comedians have become famous as television and film actors later on in life._______ person is Billy Crystal.

Though having lived abroad for years, many Chinese still ______ the traditional customs.