Great changes______in the mountain village in the last few years.For example,electric lamps______of oil ones.

A．have been taken place;have taken place

B．have taken place;have taken the place

C．have taken the place;have taken place

D．have taken the place;have taken the place

制作铁口新泥套前要检查铁口孔道和铁口中心线的偏差，当偏差超过（）mm时，应查明原因重开铁口孔道，同时校正泥炮。