___by a greater demand of vegetables,farmers have built more green houses.
问题描述:
___by a greater demand of vegetables,farmers have built more green houses.
A Driven B Being driven C To drive D Having driven
答
选A,因为后边主句的主语是farmers,前边的分句要与主句主语一致,显然用被动;同时主句的时态是完成时,显然已发生,故选A.