求助关于助动词的补充（prep2和大全181）

笨笨可可

There is a widespread belief in the United States and Western Europe that young people have a smaller commitment to work and a career than their parents and grandparents and that the source of the change lies in the collapse of the "work ethic."

(A) a smaller commitment to work and a career than their parents and grandparents

(B) less of a commitment to work and a career than their parents and grandparents

(C) a smaller commitment to work and a career than that of their parents and grandparents

(D) less of a commitment to work and a career than their parents and grandparents had
                

(E) a lessening of the commitment to work and a career that their parents and grandparents had

我认为官方OG当中把have、had一只作为实义动词来做，所以助动词只能是do、does，did，但是如果初中出来的助动词是had或者have，那么就是完成时态的用法。。

按照这个正确答案，我认为C中的had不应该是过去完成时态的助动词（因为没有明显的表示是发证在过去的过去），而应该是系表动词的用法，和Be的用法一样。。

但是下面这题：

1.        Bob Wilber became Sidney Bechet’s student and protégé 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.

(A) as anyone has ever come

(B) as anyone ever had been

(C) as anyone ever had done

(D) that anyone ever did（A）

(E) that anyone ever came

这里的答案A就是has是表示完成时的助动词。C错的原因就是因为C可以作为过去的过去，但是助动词补充只要had就可以，要不要再画蛇添足加done对吗？

请大家讨论一下。谢谢

笨笨可可

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