As the war in Libya goes on, an increasing number of people in the country         from their homes and         a safe place to stay.

A．have been driven; are trying to find

B．has been driven; is trying to find

C．are being driven; have found

D．have been driven; have tried to find

适用于钢筋混凝土拱桥施工的方法包括（）。

A．预制吊装

B．支架施工

C．顶推

D．劲性骨架法