问题
选择题
—The pollution problem here seems to get more and more serious.
--Yes. Something_____about it.
A．must do
B．must be done
C．is doing
D．had been done
答案
答案：B
考查时态及语态.句意:这儿的污染问题单好像越来越严重.——是的，对此必须做些什么。下文主语是动作对象，故用被动语态，结合语境可知选B。