1. 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
怎么得出的答案？
B 选项表答不清楚.
谓语动词要用复数，所以排除AE,ever before 表明时态要用现在完成时，所以选C
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