求助：OG（verbal) CS 54

76588443

这道题目虽然看了解释，但是还是有好多问题呀。
A patient accusing a doctor of malpractice will find it difficult to prove damage if there is  a lack of some other doctor to testify about proper medical procedures.

A. if there is  a lack of some other doctor to testify
B. unless there will be another doctor to testify
C. without another doctor's testimony
D. should there be no testimony from some other doctor
E. lacking another doctor to testify

问题一： OG 说 A中的 “lack of some other doctor” 这个应该怎么改就对了？
问题二： D这个选项用的是什么结构啊，看不太懂
问题三： E为什么是不对的呀？

谢谢各位高人了，问题很白痴，麻烦大家回答一下啦！

lonelyorchid

A: if lacking a testimony from another doctor
B: 时态呀，条件状语从句的主将从现
D: 倒装结构：there should be not testimony from some other doctor
E: lack 后不能跟 to do。很多地方说这里lacking可以被理解为修饰damage，不过如果这么说的话这句话就没有正确答案了，因为without也可以修饰damage。。。