备考GMAT语法，要吃透大纲的范围，做到非大纲语法先不看或少看，要注重基本语法，适当结合考点扩充。最终寻找适合自己的思维习惯和GMAT考试技巧，应对考试，接下来小编就给大家介绍一下GMAT语法GWD经典例题，希望对大家备考GMAT语法考试有帮助。
By sucking sap from the young twigs of the hemlock tree, tree growth is retarded by the woolly adelgid, causing needles to change color from deep green to grayish green and to drop prematurely.
A. tree growth is retarded by the woolly adelgid, causing needles to change color from deep green to grayish green and to drop
B. tree growth is retarded by the woolly adelgid, and this causes the color of needles to change from deep green to grayish green, and their dropping
C. the woolly adelgid retards tree growth, which causes needles to change color from deep green to grayish green, and dropping
D. the woolly adelgid retards tree growth, causing needles to change color from deep green to grayish green and to drop
E. the woolly adelgid retards tree growth, and this causes the color of needles to change from deep green to grayish green, and the their dropping
翻译：
蚜虫adelgid通过从年轻的铁杉树的枝条吸吮汁液，迟缓树木生长，导致针叶颜色从深绿色改变到灰绿色，并过早凋落。
句式：
By sucking sap from tree …, the woolly adelgid retards tree growth, causing needles to change color … and to drop prematurely.
思路：
见到 by sucking ,分词短语在句首，找逻辑主语来承担。见到 this ，which考虑指代修饰是否准确。见到and，考虑前后平行。
选项：
A. 吸取树汁只能是蚜虫，逻辑主语应该是wolly adelgid;
B. 同A，this不能单独指代前面的名词，必须this +n;
C. which 不能指代前面整个句子，只能就近指代growth;
D. 正确, 主句是the woolly adelgid retards tree growth，causing……伴随状语表结果;
E. this 不能单独指代。而且 to change and their dropping不平行。
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