④ The United States is well-known for its network of major highways designed to help a driver get from one place to another in the shortest possible time. _71__ these wide modern roads are generally and well maintained, with sharp curves and many straight , a direct route is not always the most one.
71. A. Although B. Because C. Since D. Therefore
从句介绍高速公路的优点,而主句提出其不足,前后显然是转折的关系,从句为让步状语从句,答案为A。
注意分析连词在从句中的作用和语意要求。
① We know, however, __88__ no two places are exactly the same.
88. A. although B. be C. whether D. that
从结构上看,空格后为宾语从句,A,B不能引导宾语从句,可以排除。从句中没有疑问或判断的意思,所以答案应该是D。
② Professors do not have the time to explain __81_ a university library works.
81. A. when B. what C. why D. how
空格后表示解释的内容,自然是做宾语的,为宾语从句。从连词和句子的关系来看,应该是表示方式,即解释如何使用图书馆,答案为D。
P
注意倒装的条件
英语中主谓倒装的情况很多,如,only + 状语置于句首倒装,含有否定意味的词置于句首倒装;so表示某人也如何;neither/nor表示某人也不如何,置于句首倒装,虚拟语气中条件句if省略,将were/should/had置于句首等等。这几年的完形填空中对倒装语序的考查集中在nor的使用上。如:
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