OG 146的题目是：
146. 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
OG的解释是：
Only C, the best choice, manages to convey the meaning of the sentence efficiently and idiomatically. Choices A and D are plagued by awkwardness and wordiness. Choice A also introduces the unidiomatic phrase lack of some other doctor. Choice B incorrectly uses a future-tense verb (will be) in the if clause; the if clause must use the present tense if it is preceded, as here, by a result clause that uses a future-tense verb (e.g., will find). Choice E introduces a dangling modifier: the lacking ... phrase cannot logically modify damage, the nearest noun.
不知D错在哪里呢？？我对if的虚拟，省略，倒装什么的总是弄不太清楚，请那位牛牛可以跟我说一说这方面的语法吗？或是哪边有比较清楚的介绍？请大家多多指教啊！！不胜感激：）
老师不是说过一般不用THERE BE 句型吗？
我想知道是不是所有的THERE BE 形式出现就是错的？
明白了明白了，说得很清楚哦，谢谢stone斑竹！！
LisayuanMM, 感觉GMAT中是不太喜欢there be句型的，这可以作为我们的一个选题的倾向，但是我觉得把出现there be的就当作错误选项，还是不太保险的说 
同意楼上,OG107就是there be选项做了正确答案
虽然和这题情况并一样，但是也不能说所有的there be都是错误的
107. Downzoning, zoning that typically results in the reduction of housing density, allows for more open space in areas where little water or services exist.
(A) little water or services exist
(B) little water or services exists
(C) few services and little water exists
(D) there is little water or services available
(E) there are few services and little available water
The adjective little modifies "mass nouns" (e.g., water), which refer to some undifferentiated quantity; the adjective few modifies "count nouns" (e.g., services), which refer to groups made up of distinct members that can be considered individually. Hence, choices A, B, and D are incorrect because little cannot properly modify services. Also, since water and services are being discussed as a pair, they should logically be treated as a compound subject requiring a plural verb; thus, the singular verbs exists (in B and C) and is (in D) are wrong. Choice E is best: the plural verb are is used, and few correctly modifies services.
谢谢bloodcherry举的例子，说得真好
而且，个人认为some other doctor的doctor应该用doctors；
請問 "some other" 後面有沒有限定可數或不可數?
看到一個說法是"some other"後面要加單數不可數名詞, 可是查了Longman電子字典的解釋是:
"used to refer to a different person or thing from the one you have already mentioned or the one that is already known about" --> 沒有特別說明可數還是不可數, 可是舉的例子剛好是單數不可數:
Can we discuss this some other time?
然後上google查, 裡面可數不可數都有...
請問有誰有比較確切的答案嗎? 因為我實在看不出ETS認為 "lack of some other doctor" unidiomatic到底是因為doctor該改成複數, 還是因為some other應該要接不可數名詞...
請各位NN們協助~!!!
楼主说的倒装好象只用于句首吧？
我觉得some other doctor是对的，some不是可以作“某个”讲吗？
testify可以作vt.，作vi.一般和to连用，所以这里的testify about应该不对
个人意见，仅供参考！！
lack n.（名词）
A deficiency or an absence:
缺乏或没有：
a lack of money.
缺乏金钱
Lack emphasizes the absence of the thing in question or the inadequacy of its supply:
Lack 强调的必须品的缺乏或其供应的不足：
She lacks the money to buy new shoes.
她没钱买新鞋。
The plant died because it lacked moisture.
这株植物因为缺乏水分而死。
What he lacks in courage he compensates for in bravado.
他用虚张声势来弥补自己勇气的匮乏。
上面讲的是作动词的情况，作名词应该也有这个意思
嗯...確實是有"some other day"這樣的說法, 可是我之前是把它理解成慣用語, 所以沒特別考慮這一點... 
wwwhahchn JJ的意思是本句要考慮的是缺乏的是 "醫生證明", 而非"醫生"本身對嗎? 句意上我可以理解, 也同意這個說法, 只是OG把"lack of some other doctor" 解釋成"unidiomatic", 而不是"illogical", 我覺得ETS是認為這種用法不正確, 可是我看不出來哪裡unidiomatic啊?
在GMAT裡面，要用another one, 不能用 some other one,
some other one 累贅，且不被認為是合適的idom.
D中哪里有if了呀，为什么说成是＂if虚拟的倒装＂，有这种米有＂if＂的虚拟么？
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