问题补充：
Don’t put off today’s work for tomorrow. I mean, today’s work today.
A. may do
B. must do
C. may be done
D. must be done
答案：
A. may do
B. must do
C. may be done
(答案→)D. must be done
解析：may可以,可能;must必须,一定. 句意:不要把今天的工作留到明天. 我的意思是,今天的工作必须今天完成. 结合语境可知下文主语为动作对象,故用被动语态. 选D.
