by a greater demand of vegetables, farmers have built more green houses. A. DrivenB. Be

发布时间：2020-08-17 13:14:38

.      by a greater demand of vegetables, farmers have built more green houses.
A. Driven
B. Being driven
C. To drive
D. Having driven

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(答案→)A. Driven
B. Being driven
C. To drive
D. Having driven
解析：
A。根据空格后的by短语可知，空格处应填过去分词或被动结构，因此可排除C和D。从动作的先后关系来看，应该是先受到蔬菜需求的驱使，菜农们后才建起了更多的温室菜地，所以空格处不能选表示进行意义的选项B，而应选表完成意义的选项A。其实，Driven by…可视为As they are driven by…之省略。
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