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.
The number of violent crimes committed in the greater metropolitan area of Sao Paolo, Brazil, more than doubled from 1975 to 1990 by the influx of drugs.（）
A. more than doubled
B. increased by more than twice
C. increased more than two times
D. was increased more than double
E. was more than doubled
答案：
参考答案：E
解析：
The clause "by the influx of drugs" at the end of the sentence means that the verb in the phrase should be passive, since the sentence specifies that the actor of the sentence is "influx"; therefore, A, B, and C are incorrect because their active verb forms do not agree with this final clause. The construction "increased more than double" in D is not idiomatic. E is the best answer.
