. __________ by a greater demand of vegetables, farmers have built more green houses. 
#98530
A
Driven
B
Being driven
C
To drive
D
Having driven
推荐题目
Whom do you think Mary will _________ into the matter instead of her?   
#88563
A
have looked
B
have to look
C
have had looking
D
have look
Martin Cooper , a US researcher , was considered _______ the first cell phone .
#96873
A
invented
B
to invent
C
having invented
D
to have invented