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 | 
