181. 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
哪位NN指点 C为什么不对?在我看来主要的差别是在时态不同,那么请问AS后面的时态如何决定?有没有什么规律来作世态相关的题目?如下531也是不清楚为什么用HAVE MADE. 多谢
531. New techniques in thermal-scanning photography, a process that records radiation from surface areas, makes it possible to study the effects of calefaction, or warming, of a river in greater detail than ever before.
(A) makes it possible to study the effects of calefaction, or warming, of a river in greater detail than ever before
(B) make it possible to study, in greater detail, the effects of calefaction, or warming, of a river than ever before
(C) have made it possible to study in greater detail than ever before the effects of calefaction, or warming, of a river
(D) make possible the study of the effects of calefaction, or warming, of a river in greater detail than it ever was before（C）
(E) has made it more possible than ever before to study in greater detail the effects of calefaction, or warming, of a river
has ever done属于比较固定的模式了吧.你换成ever 开头就有点别扭了.时态是根据句子的内容所表达的时态来确定的.
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