问题补充:
---you out the problem, Sam?
--- Not yet, but I’m going to.
A. Did, work
B. Are, working
C. Have, worked
D. Will , work
答案:
A. Did, work
B. Are, working
(答案→)C. Have, worked
D. Will , work
解析:句意:萨姆,你计算出这道数学题了吗?——还没有,但是快了。结合语境可知上文描述的是现在已经完成的动作,故用现在完成时态。选C。