XDF-S21-T17,全文大意？

isuffering

17.Bob Wilber became Sidney Bechet's student and protege when he was nineteen and , for a few years in the 1940's, came as close to being a carbon copy of the jazz virtuoso in performance as anyone has ever come.

atongmu

1940年代BW19岁的时候在SB手下混了几年，并且变得很牛(close to being a carbon copy of the jazz virtuoso in performance )——好像以前就熟悉一样。
这是我自己的理解，所以我觉得如果答案是as anyone had ever come会比较好。

isuffering

谢谢,
AS ANYONE HAS EVER COME,  至今无人能及吧

还有,
这里用TO BEING, 而不用AS 大概是避免与AS...AS..放在一起引起歧义或理解困难吧(个人见解)