“than ever before”是否一定要用完成时态？

大全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

答案C里是不是因为有than ever before ，所以要用完成时态呢？

我觉得这道题最好用完成时，表示这个tech对现在的影响。但是我觉得这个不是绝对错误。

看看其他错误：

A makes (3rd singular)错

B in greater detail 做插入语，than ever before又在句末。显然不能修饰前者。than ever before因该紧跟在detail之后

D make study possible，改变了原来的意思。原来是说的是possible to do，强调动作。make study possible强调结果

E has错

补充一句，than ever before本来是个比较级和时间没有什么太大关系。因为可以有intertemporal comparison

比如：

i am working far harder than ever before