by a greater demand for vegetables,farmers have built more green houses.
A. Driven
B. Being driven
C. To drive
D. Having driven
网友回答
(答案→)A. Driven
B. Being driven
C. To drive
D. Having driven
解析：动词+ed形式作状语时，表示该动作与句子的主语是被动关系。动词+ed形式作状语可以表示时间、原因、方式或伴随情况等。根据farmers与drive的关系可确定用动词+ed形式作状语，表示被动。