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1、一、主句单一原则任何一个句子中只可能有一个主句。做题时考生需要首先判断原题中已经给出的句子结构，如果已经有一个主句，那么就绝对不能够再出现另一个主句，除非中间有连接词进行联系。例1：___, work songs often exhibit the song cultureof a people in a fundamental form. (A) They occur where they are (B) Occuringwhere (C) Where they occur (D) Where do theyoccur分析：空
2、格后面是一个主句，(A)为带有从句的主句，空格后又是主句，有两个主句一定错。（C）为地点状语从句，正确(劳动歌曲发生的地方)。例2:___Indiana, is in a rich farming and dairy area, it is primarily a diversified industrial center (A) Fort Wayne (B) Although Fort Wayne (C) For wayne is in (D) Fort Wayne, in分析：空格后有两个谓语动词但中间没有连接词，由此可知
3、，最后一句话是一个主句，空格处应该有从句引导词，四个选项中只有（B）中although能引导从句，故选（B）。二、谓语动词专一原则任何一个句子只可能存在一个谓语动词。句子中不可能没有谓语动词，也不能多于一个谓语动词(除非中间存在连接词)。例1：William Walker's mural,“Wall of Respect,”___an outdoor wall in Chicago, deals with socialissues. (A) covers (B) covers it (C) whichcovers (D)
4、 which it covers分析：空格后的deals with 是谓语动词，A, B是谓语形式,和deals with 之间没有连接词，可先排除; D 中的it多余，因为在定语从句中which已经作了主语；（C）构成正确的定语从句例2：In copper engravings and etchings,___caused by the edges of the plate is clearly visibleon the paper. (A) the impression is (B) if the impression is
5、 (C) impressions (D) theimpression分析：题目中的is是谓语，A,B中是谓语重复。C为复数名词，与后面的谓语动词is的数不一致，故也排除。因此选择（D），caused....修饰impression三、平行结构技巧：如果填空题中空格的后面有and,或者and后面有空格，那么这道题目一定是考察平行结构。填空题中平行结构出现的形式是： A and B, A , B, and C例1：The technique of recording, classifying,and___is known as acco
6、unting. (A) an enterprise's transactions summary (B)the summarizing of an enterprise's transactions (C) transactions of an enterprise are summarized (D) summarizing the transactions of anenterprise分析：空格的后面是and,一般考平行结构，空格处缺与前面recording、classifying并列的动名词。四个选项中只有（
7、D）符合条件，故选（D）。例2：Louis T. Wright, a surgeon, developed ingenious orthopedic braces,___, and supervisedthe first use of Aureomycin on human patients. (A) treating skull fractures that he pioneered in (B) pioneered in treating skull fractures (C) which pioneered in t
8、reating skull fractures (D) he was a pioneer in the treatment ofskull fractures分析：空格后面是and,空格
