大全-21-16

16.   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. C

(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

一定要问个傻问题 要不然心里不踏实

为什么是in greater detail than ever before 而不是  in greater detail than it ever was before 如D

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