It's said that they ________ a better life ever since they moved to the US.

A．had enjoyed

B．have been enjoying

C．were enjoying

D．would enjoy

垃圾燃烧后的气体不能用碱溶液吸收的是　[ ]

A. 一氧化碳　

B. 二氧化碳

C. 二氧化硫　

D. 三氧化硫