三、平行結構

技巧：如果填空題中空格的后面有and, 或者and后面有空格，那么這道題目一定是考察平行結構。填空題中平行結構出現的形式是： A and B, A , B, and C

例1：The technique of recording, classifying, and___is known as accounting. 　　　
(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 an enterprise

分析：空格的后面是and, 一般考平行結構，空格處缺與前面recording、classifying并列的動名詞。四個選項中只有（D）符合條件，故選（D）。

例2：Louis T. Wright, a surgeon, developed ingenious orthopedic braces, ___, and supervised the 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 treating skull fractures 　　　 (D) he was a pioneer in the treatment of skull fractures

分析：空格后面是and, 空格處缺少和developed、supervised平行的謂語動詞，因此選擇（B）。