– When did you to do the work?- Two months ago we are through 80% of it at the moment.A.

问题补充：

– When did you to do the work?

- Two months ago, we are through 80% of it at the moment.

A. set off

B. set out

C. set up

D. set about

答案：

A. set off

(答案→)B. set out

C. set up

D. set about

解析：考查短语辨析。set off出发，set out to do 着手做某事，set up 建立，set about doing sth 着手做某事，句意：你是什么时候着手工作的？两个月前，此刻我们完成了工作的百分之八十了。根据语境选B。