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

谢谢执教

如果是it was的话没有办法还原，it应该承前指代to study...那么 to study ...

was in detail是不对的，所以不能用it was

还是不明白阿~

 NN们 在帮帮忙... 谢谢谢谢谢谢谢谢