对于比较结构中是否有必要补充助动词,应以是否会产生歧意为标准.如果不会产生歧意,则可以不补 出助动词,如果会产生歧意,一定要补出助动词.
51. (27205-!-item-!-188;#058&003142)
Gasoline marketing is undergoing major changes as stations often not only add convenience stores
but also combine with major fast-food chains to build complexes where customers can shop and eat as well as buy gasoline. (A) not only add convenience stores but also combine with major fast-food chains to build (B) not only add convenience stores but also they combine with major fast-food chains to build (C) are not only adding convenience stores but also in combination with major fast-food chains they build (D) add not only convenience stores, but also combining with major fast-food chains to build
(E) are not only adding convenience stores, but also in combining with major fast-food chains they build
考点: 平行对称（Parallelism）
1) not only… but also结构要平行
(A) 正确,
(B) they破坏了not only… but also的平行结构,应该去掉
(C) not only…but also结构不平行；they build…与前面句子不连贯，句子结构错误。
(D) not only… but also结构不平行,应该改为add not only convenience stores but also combination…
或者not only add…but also combine…
(E) not only… but also结构不平行；they build…与前面句子不连贯，句子结构错误。
句子结构:…marketing is undergoing…as stations often not only add…but also combine with…to
build… 52. (27251-!-item-!-188;#058&003145)
In addition to her work on the Miocene hominid fossil record, Mary Leakey contributed to documenting East African cave paintings. (A) Leakey contributed to archaeology with her discovery of the earliest direct evidence of hominid
activity and painstakingly documenting (B) Leakey contributed to archaeology by her discovery of the earliest direct evidence of hominid activity and by painstakingly documenting (C) Leakey was a contributor to archaeology with her discovery of the earliest direct evidence of hominid activity and with her painstaking documentation of (D) Leakey's contributions to archaeology include her discovery of the earliest direct evidence of
hominid activity and her painstaking documentation of (E) Leakey's contributions to archaeology include discovering the earliest direct evidence of hominid activity and painstaking documentation of
考点: 平行对称（Parallelism）
1) and, but等连词出现的时候,一定要注意前后平行
(A) and前后不平行,前者是名词discovery,后者是动名词documenting；with用于此处意思不准确。
