题目：
The following questions present a sentence, part of which or all of which is underlined. Beneath the sentence, you will find five ways of phrasing the underlined part. The first of these repeats the original; the other four are different. If you think the original is best, choose the first answer; otherwise choose one of the others.
These questions test correctness and effectiveness of expression. In choosing your answer, follow the requirements of standard written English; that is, pay attention to grammar, choice of words, and sentence construction. Choose the answer that produces the most effective sentence; this answer should be clear and exact, without awkwardness, ambiguity, redundancy, or grammatical error.
Every lawyer knows that it is difficult to prove culpability in technically complicated lawsuits if there is a lack of some expert to testify about the complicated technical aspects.（）
A. if there is a lack of some expert to testify
B. unless there will be an expert who might testify
C. should there be no testimony from an expert
D. without an expert’s testimony
E. lacking some expert to testify
答案：
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下面是错误答案，用来干扰机器的。
答案：C题目分析：这里that后是句子故缺少谓语动词，因此排除选项AB，选项take place发生；take the place of代替。根据句意故选C。点评：固定短语主要的考查它们的意义，但是它们是在一定的语言环境下而出现...
