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_ ______ by a greater demand for vegetables,farmers have built more green houses.

A.Driven                                                         B.Being driven

C.To drive                                                       D.Having driven

 _______ by a greater demand for vegetables,farmers have built more green houses.

A.Driven                                    B.Being driven

C.To drive                              D.Having driven

 ____ by a greater demand for vegetables, farmers have built more green houses.

A.Driven                     B. Being driven            C. To drive                  D. Having driven

_____by a greater demand for vegetables, farmers have built more green houses.

______ by a greater demand for vegetables,farmers have built more green houses.