________ in the mountains for a week, the two students were finally saved by the local police

A．Having lost

B．Lost

C．Being lost

D．Losing

明清时期产生了反封建的民主思想的根本原因是（）

A.商品经济的发展

B.科技的进步

C.封建制度的衰落

D.理学的演变