For the first time in this century also, many people are able to enjoy their leisure to the full,()trips to the country or seaside at weekends, instead of being confined to their neighborhood.

A. making

B. to make

C. made

D. having made

吸收塔一中回流调节阀为（），稳定塔顶进料泵出口调节阀为（）。（注：填风开、风关）