专业四八级-填空题常考结构 7
时间：2019-02-01 作者：英语课 分类：英文语法词汇
英语课
十一、状语从句省略结构 Metals expand when they are heated. Metals expand 是主句；when they are heated 是状语从句。但是这个状语从句中可以省略掉they are, 句子变成：Metals expand when heated. 但是并不是所有的状语从句都可以这么省略。这种省略从句主语的方式理论上需要满足以下两个条件：
第一、从句主语和主句主语必须保持一致； 第二、从句的谓语必须是be动词，主语和be动词同进同出， 比如上面的they和are要么同时省略，要么同时保留。
例1：Although___rigid, bones exhibit a degree of elasticity 2 that enables the skeleton to withstand considerable impact. (A) apparently 3 (B) are apparently (C) apparently their (D) are they apparently 分析：连词although通常引导主谓完整的状语从句，当从句主语与主句主语相同、从句谓语又为系表结构时，则可省略主语和连系动词，故正确答案为（A）。Although apparently rigid 1 = Although bones are apparently rigid, 注意bones和are必须同时省略。
因此，我们从上面的例题中来分析一下填空题中状语从句省略以后的形式： though, although, even thought, while, If, when等为引导状语从句的词； 这些词后面一定+形容词(分词)，主句（注意逗号的后面是主句，前面是从句）
例2：All marble is composed of crystals of the minerals calcite or dolomite, ___, are perfectly 4 white. (A) when, pure which (B) when, which pure (C) which, pure when (D) which, when pure 分析：空格前是个完整的句子，空格后是系表结构，空格处显然缺非限定性定语从句的引导词兼作从句主语。（A）、（B）不引导非限定性定语从句，可首先排除。（C）中的pure和when位置错了，故选（D）。注意when pure是插入语，同时也是省略用法when they are pure；which are perfectly white, 状语从句省略结构，
例3：___relatively costly 5, the diesel 6 engine is highly efficient and needs servicing infrequently (A) Even (B) It is (C) Even though (D) There is 分析：B和D填入后，都是构成两个主句，不对；Even though则引导状语从句，even though it is, 这里it is 已经省略。
第一、从句主语和主句主语必须保持一致； 第二、从句的谓语必须是be动词，主语和be动词同进同出， 比如上面的they和are要么同时省略，要么同时保留。
例1：Although___rigid, bones exhibit a degree of elasticity 2 that enables the skeleton to withstand considerable impact. (A) apparently 3 (B) are apparently (C) apparently their (D) are they apparently 分析：连词although通常引导主谓完整的状语从句，当从句主语与主句主语相同、从句谓语又为系表结构时，则可省略主语和连系动词，故正确答案为（A）。Although apparently rigid 1 = Although bones are apparently rigid, 注意bones和are必须同时省略。
因此，我们从上面的例题中来分析一下填空题中状语从句省略以后的形式： though, although, even thought, while, If, when等为引导状语从句的词； 这些词后面一定+形容词(分词)，主句（注意逗号的后面是主句，前面是从句）
例2：All marble is composed of crystals of the minerals calcite or dolomite, ___, are perfectly 4 white. (A) when, pure which (B) when, which pure (C) which, pure when (D) which, when pure 分析：空格前是个完整的句子，空格后是系表结构，空格处显然缺非限定性定语从句的引导词兼作从句主语。（A）、（B）不引导非限定性定语从句，可首先排除。（C）中的pure和when位置错了，故选（D）。注意when pure是插入语，同时也是省略用法when they are pure；which are perfectly white, 状语从句省略结构，
例3：___relatively costly 5, the diesel 6 engine is highly efficient and needs servicing infrequently (A) Even (B) It is (C) Even though (D) There is 分析：B和D填入后，都是构成两个主句，不对；Even though则引导状语从句，even though it is, 这里it is 已经省略。
adj.严格的，死板的；刚硬的，僵硬的
- She became as rigid as adamant.她变得如顽石般的固执。
- The examination was so rigid that nearly all aspirants were ruled out.考试很严，几乎所有的考生都被淘汰了。
n.弹性，伸缩力
- The skin eventually loses its elasticity.皮肤最终会失去弹性。
- Every sort of spring has a definite elasticity.每一种弹簧都有一定的弹性。
adv.显然地；表面上，似乎
- An apparently blind alley leads suddenly into an open space.山穷水尽，豁然开朗。
- He was apparently much surprised at the news.他对那个消息显然感到十分惊异。
adv.完美地，无可非议地，彻底地
- The witnesses were each perfectly certain of what they said.证人们个个对自己所说的话十分肯定。
- Everything that we're doing is all perfectly above board.我们做的每件事情都是光明正大的。
adj.昂贵的，价值高的，豪华的
- It must be very costly to keep up a house like this.维修这么一幢房子一定很昂贵。
- This dictionary is very useful,only it is a bit costly.这本词典很有用，左不过贵了些。