问题补充:
I used to go to the gym three times a week, but I don’t any more.
A. work on
B. work at
C. work out
D. work for
答案:
A. work on
B. work at
(答案→)C. work out
D. work for
解析:考查动词短语:A. work on从事,忙于,B. work at致力于,C. work out锻炼,制定出,结果是,D. work for为…工作,句意:我过去一个星期去三次健身房,现在我不去锻炼了。选C。